Cita APA (7th ed.)
Babbie, E. R. (1986). The practice of social research (4th ed.). Wadsworth Pub. Co..
Cita Chicago (17th ed.)
Babbie, Earl R. The Practice of Social Research. 4th ed. Belmont, Calif.: Wadsworth Pub. Co., 1986.
Cita MLA (9th ed.)
Babbie, Earl R. The Practice of Social Research. 4th ed. Wadsworth Pub. Co., 1986.
Atenció: Aquestes cites poden no estar 100% correctes.