Gaya APA

Case, K, E. et al (2012). Principles of Macroeconomics (Tenth Edition) (Tenth Edition). Boston: Pearson Education, Inc..

Gaya MLA

Case, Karl, E.. et al. "Principles of Macroeconomics (Tenth Edition)". Tenth Edition Boston: Pearson Education, Inc., 2012. Hardcopy (Textbook).