Cita APA

Babbie, E., & Earl Babbie. The practice of social research. Belmont, CA: Thomson Wadsworth.

Chicago Style Citation

Babbie, Earl, i Earl Babbie. The Practice of Social Research. Belmont, CA: Thomson Wadsworth.

Cita MLA

Babbie, Earl, i Earl Babbie. The Practice of Social Research. Belmont, CA: Thomson Wadsworth.

Atenció: Aquestes cites poden no estar 100% correctes.