APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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