Παραπομπή APA

Earl Babbie R. (2014). The basics of social research (Sixth edition.). Wadsworth.

Παραπομπή Chicago Style

Earl Babbie R. The Basics of Social Research. Sixth edition. USA: Wadsworth, 2014.

Παραπομπή MLA

Earl Babbie R. The Basics of Social Research. Sixth edition. Wadsworth, 2014.