APA استشهاد

Sapsford, R. (2007). Survey research (2nd. ed.). Sage.

استشهاد بنمط شيكاغو

Sapsford, Roger. Survey Research. 2nd. ed. New Delhi: Sage, 2007.

MLA استشهاد

Sapsford, Roger. Survey Research. 2nd. ed. Sage, 2007.