1. Korneeva E.L. Osnovnye napravleniya issledovaniya volonterskoi deyatel'nosti [Elektronnyi resurs] [Korneyev E.L. The main directions of research volunteering]. Psikhologicheskaya nauka i obrazovanie psyedu.ru [Psychological Science and Education psyedu.ru.], 2015, vol. 7, no. 1, pp. 131â141. Available at: https://psyjournals.ru/psyedu_ru/2015/n1/75666.shtml (Accessed 08.02.2019). (In Russ.; Abstr. in Engl.).
2. Sorokin P.A. Glavnye tendentsii nashego vremeni [Elektronnyi resurs] [The main trends of our time]. Moscow: Direkt-Media, 2007. 416 p. Available at: https://biblioclub.ru/index.php?page=book&id=36165 (Accessed 08.02.2019). (In Russ.).
3. Cnaan R.A., Goldberg-Glen R.S. Measuring Motivation to Volunteer in Human Services. Journal of Applied Behavioral Sciences, 1991, vol. 27, no. 3, pp. 269â284. doi:10.1177/0021886391273003
4. Cook C.E. Participation in Public Interest Groups. American Politics Quarterly, 1984, vol. 12, no. 4, pp. 409â430. doi:10.1177/1532673X8401200402
5. Florin P.E. Jones, Wandersman A. Black Participation in Voluntary Associations. Journal of Voluntary Action Research, 1986, vol. 15, no. 1, pp. 65â86. doi:10.1177/089976408601500105