APA (7th ed.) Citation

Sikes, E. R. (1951). Contemporary economic systems (Rev. ed.). Holt.

Chicago Style (17th ed.) Citation

Sikes, Earl Ray. Contemporary Economic Systems. Rev. ed. New York: Holt, 1951.

MLA (9th ed.) Citation

Sikes, Earl Ray. Contemporary Economic Systems. Rev. ed. Holt, 1951.