“…The snowball sampling has been used in the research of, among others, gang members (Patrick, 2013), drug users (Hendriks, Blanken, Adriaans & Hartnoll, 1992), prostitutes (McNamara, 1994), sexual minorities (Browne, 2005), homeless people (Dávid & Snijders, 2002), migrants (Adedeji, 2019;Bilsborrow, 2006). It can also be used to survey populations operating in conflict regions (Cohen & Arieli, 2011;Taarup-Esbensen, 2017) and as a modification of expert sampling (May 2017(May , 2015.…”