Παραπομπή APA

Ulmer, M. J. (1965). Economics: Theory and practice. Houghton Mifflin.

Παραπομπή Chicago Style

Ulmer, Melville J. Economics: Theory and Practice. Boston: Houghton Mifflin, 1965.

Παραπομπή MLA

Ulmer, Melville J. Economics: Theory and Practice. Houghton Mifflin, 1965.