Gaya APA

Principles of economics / Karl E. Case ; Ray C. Fair. (1989). Upper Saddle River, NJ: Prentice-Hall, c.

Gaya MLA

Principles of economics / Karl E. Case ; Ray C. Fair. 5th ed.. Upper Saddle River, NJ: Prentice-Hall, c, 1989. Buku Wajib.