Cita APA (7th ed.)

Nichols, D. A., & Reynolds, C. W. (1971). Principles of economics. Holt, Rinehart and Winston.

Cita Chicago (17th ed.)

Nichols, Donald A., i Clark W. Reynolds. Principles of Economics. Nueva York: Holt, Rinehart and Winston, 1971.

Cita MLA (9th ed.)

Nichols, Donald A., i Clark W. Reynolds. Principles of Economics. Holt, Rinehart and Winston, 1971.