1. EEBO = Early English Books Online . Davies , Mark ( comp. ). < https://eebo.chadwyck.com/home >
2. Gephi = < https://gephi.org >
3. Mallet = Machine Learning for LanguagE Toolkit . < http://mallet.cs.umass.edu/topics.php >
4. Textplot = < http://dclure.org/tutorials/textplot-refresh/ >