Gaya APA

Gregory, P, R, &, S, R, C. (1989). Comparative economic systems, 3rd ed. . Boston: Boston Houghton Mifflin Company.

Gaya MLA

Gregory, Paul, R., &, Stuart,, Robert, C.. "Comparative economic systems, 3rd ed. ". Boston: Boston Houghton Mifflin Company, 1989. Buku.