Tohutoro APA (7th ed.)

Spencer, M. (1983). Contemporary economics (5th. ed.). Worth.

Tohutoru Kātū Chicago (17th ed.)

Spencer, Milton. Contemporary Economics. 5th. ed. New York: Worth, 1983.

Tohutoro MLA (9th ed.)

Spencer, Milton. Contemporary Economics. 5th. ed. Worth, 1983.