Kubiciel-Lodzińska, S. (2021). 
	Snowball Sampling vs. Respondent Driven Sampling in Regional Research. Comparing the use of the Methods to Study Migrants Working in Elderly Care. Studia Migracyjne – Przegląd Polonijny, 2021, 149-180. doi: https://doi.org/10.4467/25444972SMPP.21.007.13319