Cita APA (7th ed.)
Babbie, E. R. (1979). The practice of social research (2nd ed.). Wadsworth.
Cita Chicago (17th ed.)
Babbie, Earl R. The Practice of Social Research. 2nd ed. Belmont: Wadsworth, 1979.
Cita MLA (9th ed.)
Babbie, Earl R. The Practice of Social Research. 2nd ed. Wadsworth, 1979.
Atenció: Aquestes cites poden no estar 100% correctes.