APA (7th ed.) Citation

Castillo, A. V. (1959). Principles of economics (1959 ed.). University Book Supply.

Chicago Style (17th ed.) Citation

Castillo, Andres Villegas. Principles of Economics. 1959 ed. Manila: University Book Supply, 1959.

MLA (9th ed.) Citation

Castillo, Andres Villegas. Principles of Economics. 1959 ed. University Book Supply, 1959.

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