Cita APA (7a ed.)

Sikes, E. R. (1951). Contemporary economic systems: By Earl Ray Sikes (Rev. ed.). Holt.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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