Cita APA (7th ed.)
Henderson, J. V. (1991). Principles of economics. D.C. Health.
Cita Chicago (17th ed.)
Henderson, J Vernon. Principles of Economics. Massachusetts: D.C. Health, 1991.
Cita MLA (9th ed.)
Henderson, J Vernon. Principles of Economics. D.C. Health, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.