APA (7th ed.) Citation

Castillo, A. V. 1. (1953). Principles of economics. University Pub.

Chicago Style (17th ed.) Citation

Castillo, Andres Villegas 1903. Principles of Economics. Manila: University Pub, 1953.

MLA (9th ed.) Citation

Castillo, Andres Villegas 1903. Principles of Economics. University Pub, 1953.