Wilkinson, D., & Birmingham, P. (2003). Using research instruments: A guide for researchers. RoutledgeFalmer.
Chicago Style aipamenaWilkinson, David, and Peter Birmingham. Using Research Instruments: A Guide for Researchers. London: RoutledgeFalmer, 2003.
MLA aipamenaWilkinson, David, and Peter Birmingham. Using Research Instruments: A Guide for Researchers. RoutledgeFalmer, 2003.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.