Tohutoro APA (7th ed.)

Spencer, M. (1986). Contemporary economics (6th. ed.). Worth.

Tohutoru Kātū Chicago (17th ed.)

Spencer, Milton. Contemporary Economics. 6th. ed. New York: Worth, 1986.

Tohutoro MLA (9th ed.)

Spencer, Milton. Contemporary Economics. 6th. ed. Worth, 1986.