Gaya APA

Heilbroner, R, L., Ford, A, M. (1971). Is Economics Relevant? " A Reader In Politics Economics " . California: Goodyear Publishing Company.

Gaya MLA

Heilbroner, Robert, L.., Ford, Arthur, M.. "Is Economics Relevant? " A Reader In Politics Economics "". California: Goodyear Publishing Company, 1971. Text.