Munzert, S., Rubba, C., Meißner, P., & Nyhuis, D. (2014, July 28). Regular Expressions and Essential String Functions. Automated Data Collection with R: A Practical Guide to Web Scraping and Text Mining, 196-218. https://doi.org/10.1002/9781118834732.ch8
Chicago-Zitierstil (17. Ausg.)Munzert, Simon, Christian Rubba, Peter Meißner, und Dominic Nyhuis. "Regular Expressions and Essential String Functions." Automated Data Collection with R: A Practical Guide to Web Scraping and Text Mining 28 Jul. 2014: 196-218. https://doi.org/10.1002/9781118834732.ch8.
MLA-Zitierstil (9. Ausg.)Munzert, Simon, et al. "Regular Expressions and Essential String Functions." Automated Data Collection with R: A Practical Guide to Web Scraping and Text Mining, 28 Jul. 2014, pp. 196-218, https://doi.org/10.1002/9781118834732.ch8.