Munzert, S., Rubba, C., Meißner, P., & Nyhuis, D. (2014). Automated data collection with R: A practical guide to web scraping and text mining. John Wiley & Sons.
Beaulieu, A. (2009). Learning SQL: Master SQL Fundamentals. O’Reilly Media, Inc.
Stephens, R., Plew, R., & Jones, A. D. (2009). Sams teach yourself SQL in one hour a day. Sams Publishing.
Workshop materials: collecting and analyzing social media data with R, by Pablo Barberá. LSE, January 2018.