@article{aup:/content/journals/10.5117/KWALON2021.3.008.WEST, author = "Wester, Fred", title = "Hoe groot moet mijn steekproef zijn?", journal= "KWALON", year = "2021", volume = "26", number = "3", pages = "", doi = "https://doi.org/10.5117/KWALON2021.3.008.WEST", url = "https://www.aup-online.com/content/journals/10.5117/KWALON2021.3.008.WEST", publisher = "Amsterdam University Press", issn = "1875-7324", type = "Journal Article", }