Gaya APA

C.E, F, U, ,., Kreps, J, ., M. (1962). Principles of Economics (-). America: Rine Hart And Winston.

Gaya MLA

C.E, Ferg, Uson, ,., Kreps, Juanita, ., M. "Principles of Economics". - America: Rine Hart And Winston, 1962. Text.