Cita APA (7th ed.)

Ulmer, M. J. (1965). Economics: Theory and practice (2a. ed.). Houghton Miflin.

Cita Chicago (17th ed.)

Ulmer, Melville J. Economics: Theory and Practice. 2a. ed. Boston: Houghton Miflin, 1965.

Cita MLA (9th ed.)

Ulmer, Melville J. Economics: Theory and Practice. 2a. ed. Houghton Miflin, 1965.