APA استشهاد

Townsend,Harry. (1980). Price theory (2nd ed.). Penguin Books.

استشهاد بنمط شيكاغو

Townsend,Harry. Price Theory. 2nd ed. England: Penguin Books, 1980.

MLA استشهاد

Townsend,Harry. Price Theory. 2nd ed. Penguin Books, 1980.