APA استشهاد

Crotty,, M. (1998). Foundations of social research (1st.). Sage.

استشهاد بنمط شيكاغو

Crotty,, Michael. Foundations of Social Research. 1st. London: Sage, 1998.

MLA استشهاد

Crotty,, Michael. Foundations of Social Research. 1st. Sage, 1998.