Gaya APA

Principles of economics / Karl E. Case ; Ray C. Fair. (2001). Upper Saddle River, NJ: Prentice-Hall, c.

Gaya MLA

Principles of economics / Karl E. Case ; Ray C. Fair. 6th ed.. Upper Saddle River, NJ: Prentice-Hall, c, 2001. Buku Wajib.