Cita APA (7th ed.)

Babbie, E. R. (1990). Survey research methods (2nd ed.). California.

Cita Chicago (17th ed.)

Babbie, Earl R. Survey Research Methods. 2nd ed. Belmont: California, 1990.

Cita MLA (9th ed.)

Babbie, Earl R. Survey Research Methods. 2nd ed. California, 1990.