Update README.md

Yingjie4Science · Apr 9, 2024 · 9451789 · 9451789
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@@ -118,13 +118,16 @@ The SDGdetector **R** package is distributed under the [GNU General Public Licen
 Get citation information for *SDGdetector* in R doing
     `citation(package = 'SDGdetector')`
 
-```
+
 To cite SDGdetector in publications, please use:
 
-  Li, Y., Frans, V.F., Song, Y., Cai, M., Zhang, Y., Liu, J. (2023). SDGdetector: an R-based text mining tool for quantifying efforts toward Sustainable Development Goals. Journal of Open Source Software 8(84), 5124. https://doi.org/10.21105/joss.05124.
+```
+Li, Y., Frans, V.F., Song, Y., Cai, M., Zhang, Y., Liu, J. (2023). SDGdetector: an R-based text mining tool for quantifying efforts toward Sustainable Development Goals. Journal of Open Source Software 8(84), 5124. https://doi.org/10.21105/joss.05124.
+```
 
 A BibTeX entry for LaTeX users is
 
+```
   @Article{,
     title = {SDGdetector: an R-based text mining tool for quantifying efforts toward Sustainable Development Goals},
     author = {Yingjie Li and Veronica F. Frans and Yongze Song and Meng Cai and Yuqian Zhang and Jianguo Liu},