Gaya APA

Thurow, L, C., Heilbroner, R, L. (1978). The economic problem (Ed.5). America: Prentice Hall Internasional.

Gaya MLA

Thurow, Lester, C.., Heilbroner, Robert, L.. "The economic problem". Ed.5 America: Prentice Hall Internasional, 1978. Text.