diff --git a/.gitignore b/.gitignore
index ffdd1dc..9d58ef8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@
 .Ruserdata
 /.quarto/
 /_book/
+/texto/
diff --git a/_quarto.yml b/_quarto.yml
index af94477..1d60db6 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -4,6 +4,7 @@ project:
 execute: 
   #echo: false
   warning: false
+  cache: true
 #filters: 
   #- webr
   #- abstract-section:
diff --git a/docs/index.html b/docs/index.html
index cf4818c..4099632 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -108,7 +108,7 @@
 <meta property="og:image:width" content="400">
 </head>
 
-<body class="nav-sidebar floating">
+<body class="nav-sidebar floating fullcontent">
 
 <div id="quarto-search-results"></div>
   <header id="quarto-header" class="headroom fixed-top">
@@ -222,18 +222,7 @@
 </nav>
 <div id="quarto-sidebar-glass" data-bs-toggle="collapse" data-bs-target="#quarto-sidebar,#quarto-sidebar-glass"></div>
 <!-- margin-sidebar -->
-    <div id="quarto-margin-sidebar" class="sidebar margin-sidebar">
-        <nav id="TOC" role="doc-toc" class="toc-active">
-    <h2 id="toc-title">Table of contents</h2>
-   
-  <ul>
-  <li><a href="#abstract" id="toc-abstract" class="nav-link active" data-scroll-target="#abstract">Abstract</a>
-  <ul class="collapse">
-  <li><a href="#citation" id="toc-citation" class="nav-link" data-scroll-target="#citation">Citation</a></li>
-  </ul></li>
-  </ul>
-</nav>
-    </div>
+    
 <!-- main -->
 <main class="content" id="quarto-document-content">
 
@@ -245,9 +234,10 @@ <h1 class="title display-7">Smart Choices for Measurement Models</h1>
 <p class="date">December 27, 2023</p>
 </header>
 
-
-<section id="abstract" class="level1 unnumbered">
-<h1 class="unnumbered">Abstract</h1><p><img src="img/cover.png" title="Smart Choices for Measurement Models" class="quarto-cover-image img-fluid"></p>
+<p><img src="img/cover.png" title="Smart Choices for Measurement Models" class="quarto-cover-image img-fluid"></p>
+<p>Citation:</p>
+<section id="abstract" class="level1 unnumbered unlisted">
+<h1 class="unnumbered unlisted">Abstract</h1>
 <p>This is a Quarto article.</p>
 <p>To learn more about Quarto books visit <a href="https://quarto.org/docs/books" class="uri">https://quarto.org/docs/books</a>.</p>
 <div class="cell">
@@ -256,11 +246,8 @@ <h1 class="unnumbered">Abstract</h1><p><img src="img/cover.png" title="Smart Cho
 <pre><code>[1] 2</code></pre>
 </div>
 </div>
-<section id="citation" class="level3 unnumbered">
-<h3 class="unnumbered anchored" data-anchor-id="citation">Citation</h3>
 
 
-</section>
 </section>
 
 </main> <!-- /main -->
diff --git a/docs/search.json b/docs/search.json
index 2dbc067..30e3156 100644
--- a/docs/search.json
+++ b/docs/search.json
@@ -4,7 +4,7 @@
     "href": "index.html",
     "title": "Smart Choices for Measurement Models",
     "section": "",
-    "text": "Abstract\nThis is a Quarto article.\nTo learn more about Quarto books visit https://quarto.org/docs/books.\n\n1 + 1\n\n[1] 2\n\n\n\nCitation"
+    "text": "Citation:\n\nAbstract\nThis is a Quarto article.\nTo learn more about Quarto books visit https://quarto.org/docs/books.\n\n1 + 1\n\n[1] 2"
   },
   {
     "objectID": "01-intro.html",
diff --git a/docs/sitemap.xml b/docs/sitemap.xml
index 9a0514c..69847fa 100644
--- a/docs/sitemap.xml
+++ b/docs/sitemap.xml
@@ -2,11 +2,11 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
     <loc>https://phdpablo.github.io/smart-cfa/index.html</loc>
-    <lastmod>2023-12-28T04:47:18.743Z</lastmod>
+    <lastmod>2023-12-29T16:01:38.792Z</lastmod>
   </url>
   <url>
     <loc>https://phdpablo.github.io/smart-cfa/01-intro.html</loc>
-    <lastmod>2023-12-28T04:47:18.745Z</lastmod>
+    <lastmod>2023-12-29T15:58:58.218Z</lastmod>
   </url>
   <url>
     <loc>https://phdpablo.github.io/smart-cfa/02-smart-choices.html</loc>
diff --git a/index.qmd b/index.qmd
index eb4dece..3e912bf 100644
--- a/index.qmd
+++ b/index.qmd
@@ -1,4 +1,6 @@
-# Abstract {.unnumbered}
+Citation:
+
+# Abstract {.unnumbered .unlisted}
 
 This is a Quarto article.
 
@@ -8,4 +10,3 @@ To learn more about Quarto books visit <https://quarto.org/docs/books>.
 1 + 1
 ```
 
-### Citation {.unnumbered} 
diff --git a/references.bib b/references.bib
index 3881b73..ae8c518 100644
--- a/references.bib
+++ b/references.bib
@@ -26,3 +26,34 @@ @techreport{abdurrob2016
 	date = {2016-08},
 	address = {Boston}
 }
+
+@inbook{hughes2018,
+	title = {Psychometric Validity: Establishing the Accuracy and Appropriateness of Psychometric Measures},
+	author = {Hughes, David J.},
+	editor = {Irwing, Paul and Booth, Tom and Hughes, David J.},
+	year = {2018},
+	date = {2018},
+	publisher = {John Wiley & Sons Ltd.}
+}
+
+@inbook{sireci2013,
+	title = {Test validity},
+	author = {Sireci, Stephen G. and Sukin, Tia},
+	year = {2013},
+	date = {2013},
+	publisher = {American Psychological Association},
+	pages = {61--84},
+	doi = {10.1037/14047-004},
+	url = {http://content.apa.org/books/14047-004},
+	note = {DOI: 10.1037/14047-004},
+	address = {Washington}
+}
+
+@book{bandalos2018,
+	title = {Measurement theory and applications for the social sciences},
+	author = {Bandalos, Deborah L.},
+	year = {2018},
+	date = {2018},
+	publisher = {Guilford Press},
+	address = {New York}
+}
