Cita APA (7th ed.)

HALM, G. N. (1968). Economic systems: A comparative analysis. Holt.

Cita Chicago (17th ed.)

HALM, George N. Economic Systems: A Comparative Analysis. New York: Holt, 1968.

Cita MLA (9th ed.)

HALM, George N. Economic Systems: A Comparative Analysis. Holt, 1968.