Automated Data Collection with R-A Practical Guide to Web Scraping and Text Mining

Link: http://repo.darmajaya.ac.id/3825/1/Automated%20Data%20Collection%20with%20R_%20A%20Practical%20Guide%20to%20Web%20Scraping%20and%20Text%20Mining%20%28%20PDFDrive%20%29.pdf