Gaya APA

EBOOK : Based on Schaum' s Outline of Theory and Problems of Principles of Economics (Second Edition). (2003). New York: Mc Graw-Hill.

Gaya MLA

EBOOK : Based on Schaum' s Outline of Theory and Problems of Principles of Economics (Second Edition). 2. New York: Mc Graw-Hill, 2003. Text.