Bittmann, Felix. "3. Cleaning and preparing data". Stata: A Really Short Introduction, Berlin, Boston: De Gruyter Oldenbourg, 2019, pp. 16-45. https://doi.org/10.1515/9783110617160-003
Bittmann, F. (2019). 3. Cleaning and preparing data. In Stata: A Really Short Introduction (pp. 16-45). Berlin, Boston: De Gruyter Oldenbourg. https://doi.org/10.1515/9783110617160-003
Bittmann, F. 2019. 3. Cleaning and preparing data. Stata: A Really Short Introduction. Berlin, Boston: De Gruyter Oldenbourg, pp. 16-45. https://doi.org/10.1515/9783110617160-003
Bittmann, Felix. "3. Cleaning and preparing data" In Stata: A Really Short Introduction, 16-45. Berlin, Boston: De Gruyter Oldenbourg, 2019. https://doi.org/10.1515/9783110617160-003
Bittmann F. 3. Cleaning and preparing data. In: Stata: A Really Short Introduction. Berlin, Boston: De Gruyter Oldenbourg; 2019. p.16-45. https://doi.org/10.1515/9783110617160-003