Dyfyniad APA

Heilbroner, R. L., & Thurow, L. C. (1975). The economic problem (4th ed.). Prentice-Hall.

Dyfyniad Arddull Chicago

Heilbroner, Robert L., and Lester C. Thurow. The Economic Problem. 4th ed. Englewood Cliffs, N.J.: Prentice-Hall, 1975.

Dyfyniad MLA

Heilbroner, Robert L., and Lester C. Thurow. The Economic Problem. 4th ed. Prentice-Hall, 1975.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.