Παραπομπή APA

Peterson, W. L. (1990). Principles of economics: Micro (Ed.7.).

Παραπομπή Chicago Style

Peterson, Willis L. Principles of Economics: Micro. Ed.7. New Delhi, Universal Book Stall, 1990.

Παραπομπή MLA

Peterson, Willis L. Principles of Economics: Micro. Ed.7. 1990.