The history library is published to the public npm registry. You can install it using:
$ npm install --save history
Then, use as you would anything else:
// using ES6 modules
import { createBrowserHistory } from 'history';
// using CommonJS modules
var createBrowserHistory = require('history').createBrowserHistory;
If you really just want a <script>
tag, the UMD build is available on unpkg:
<script src="https://unpkg.com/history"></script>
You can find the library on window.History
.