Παραπομπή APA

Vans, D. A. d. (2003). Surveys in social research. Rawat.

Παραπομπή Chicago Style

Vans, D. A de. Surveys in Social Research. Jaipur, New Delhi: Rawat, 2003.

Παραπομπή MLA

Vans, D. A de. Surveys in Social Research. Rawat, 2003.