APA
Yakovleva, A. A. (2016). Studies of Hard-to-Reach Populations: the Experience of the Respondent-Driven Sampling and Time-Location Sampling. Sociology: Methodology, Methods, Mathematical Modeling (Sociology: 4M), (33), 57-79. Retrieved from https://soc4m.ru/index.php/soc4m/article/view/3721