Παραπομπή APA

Heilbroner,Robert L, & Thurow,Lester C. (1978). The economic problem (5.). Prentice Hall, INC.

Παραπομπή Chicago Style

Heilbroner,Robert L, και Thurow,Lester C. The Economic Problem. 5. London: Prentice Hall, INC, 1978.

Παραπομπή MLA

Heilbroner,Robert L, και Thurow,Lester C. The Economic Problem. 5. Prentice Hall, INC, 1978.