Alreck, P. L., & Settle, R. B. (2004). The survey research handbook (3rd ed.). McGraw-Hill/Irwin.
Chicago Style aipamenaAlreck, Pamela L., and Robert B. Settle. The Survey Research Handbook. 3rd ed. Boston: McGraw-Hill/Irwin, 2004.
MLA aipamenaAlreck, Pamela L., and Robert B. Settle. The Survey Research Handbook. 3rd ed. McGraw-Hill/Irwin, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.