Cita APA (7th ed.)

Heilbroner, R. L. (1970). The economic problem (2nd ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Heilbroner, Robert L. The Economic Problem. 2nd ed. Englewood Cliffs, N.J: Prentice-Hall, 1970.

Cita MLA (9th ed.)

Heilbroner, Robert L. The Economic Problem. 2nd ed. Prentice-Hall, 1970.