Nichols, P. (1991). Social survey methods: A fieldguide for development workers. Oxfam Publications.
Chicago-viite (17. p.)Nichols, Paul. Social Survey Methods: A Fieldguide for Development Workers. Oxford: Oxfam Publications, 1991.
MLA-viite (8. p.)Nichols, Paul. Social Survey Methods: A Fieldguide for Development Workers. Oxfam Publications, 1991.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.