APA aipamena

Spector, P. E. (1981). Research designs. Sage Publications.

Chicago Style aipamena

Spector, Paul E. Research Designs. Beverly Hills: Sage Publications, 1981.

MLA aipamena

Spector, Paul E. Research Designs. Sage Publications, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.