Wagenaar, T. C., & Babbie, E. R. (1998). Practicing social research: Guided activities to accompany : the practice of social research (Eight edition.). Wadsworth Publishing Company.
Cita Chicago (17th ed.)Wagenaar, Theodore C., i Earl R. Babbie. Practicing Social Research: Guided Activities to Accompany : The Practice of Social Research. Eight edition. Belmont, California: Wadsworth Publishing Company, 1998.
Cita MLA (9th ed.)Wagenaar, Theodore C., i Earl R. Babbie. Practicing Social Research: Guided Activities to Accompany : The Practice of Social Research. Eight edition. Wadsworth Publishing Company, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.