APA استشهاد

Ulmer, M. (1965). Economics: Theory and Practice (2nd ed.). Houghton Mifflin.

استشهاد بنمط شيكاغو

Ulmer, Melville. Economics: Theory and Practice. 2nd ed. Boston: Houghton Mifflin, 1965.

MLA استشهاد

Ulmer, Melville. Economics: Theory and Practice. 2nd ed. Houghton Mifflin, 1965.