APA (7th ed.) Citation

Castillo, A. V. (1957). Principles of economics (1957 ed.). University Book Supply.

Chicago Style (17th ed.) Citation

Castillo, Andres Villegas. Principles of Economics. 1957 ed. Manila: University Book Supply, 1957.

MLA (9th ed.) Citation

Castillo, Andres Villegas. Principles of Economics. 1957 ed. University Book Supply, 1957.

Warning: These citations may not always be 100% accurate.