Article: https://towardsdatascience.com/an-accidental-side-effect-of-text-mining-4b43f8ee1273
Code: https://github.com/korur/textmining/blob/master/code_kindle_text_mining.Rmd
Data: https://github.com/korur/textmining/blob/master/Kindle_highlights_Serdar.Rmd