APA استشهاد

Gavetter, F. J. (2012). Research methods for the behavioural science (4th ed.). Wadsworth.

استشهاد بنمط شيكاغو

Gavetter, Fredrick J. Research Methods for the Behavioural Science. 4th ed. Australia: Wadsworth, 2012.

MLA استشهاد

Gavetter, Fredrick J. Research Methods for the Behavioural Science. 4th ed. Wadsworth, 2012.