Gaya APA

Case, K, E., Fair, R, C. (2007). Principles of economics (8 th ed, 1 st impression). New Delhi: Pearson Education and Darling Krindersley Publishing.

Gaya MLA

Case, Karl, E.., Fair, Ray, C.. "Principles of economics". 8 th ed, 1 st impression New Delhi: Pearson Education and Darling Krindersley Publishing, 2007. Text.