APA (7th ed.) Citation

Medina, R. G. (2003). Principles of economics. Published and distributed by Rex Book Store.

Chicago Style (17th ed.) Citation

Medina, Roberto G. Principles of Economics. Manila: Published and distributed by Rex Book Store, 2003.

MLA (9th ed.) Citation

Medina, Roberto G. Principles of Economics. Published and distributed by Rex Book Store, 2003.