Cita APA (7th ed.)

Castillo, A. V. (1980). Principles of economics (Rev. ed.). World Current Events].

Cita Chicago (17th ed.)

Castillo, Andres Villegas. Principles of Economics. Rev. ed. [Manilan: World Current Events], 1980.

Cita MLA (9th ed.)

Castillo, Andres Villegas. Principles of Economics. Rev. ed. World Current Events], 1980.