APA (7th ed.) Citation

Spector, P. E. (1990). Research designs (11. pr.). Sage.

Chicago Style (17th ed.) Citation

Spector, Paul E. Research Designs. 11. pr. Newbury Park u.a: Sage, 1990.

MLA (9th ed.) Citation

Spector, Paul E. Research Designs. 11. pr. Sage, 1990.