APA (7th ed.) Citation

Samuelson, P. A., & Nordhaus, W. D. (1993). Economics (14th ed.). National Book Store.

Chicago Style (17th ed.) Citation

Samuelson, Paul Anthony, and William D. Nordhaus. Economics. 14th ed. [Manila]: National Book Store, 1993.

MLA (9th ed.) Citation

Samuelson, Paul Anthony, and William D. Nordhaus. Economics. 14th ed. National Book Store, 1993.