Cita APA

Villegas, B. M., & Abola, V. A. (1982). Economics: An introduction. Sinag-Tala Pub.

Citación estilo Chicago

Villegas, Bernardo M., and Victor A. Abola. Economics: An Introduction. Manila: Sinag-Tala Pub, 1982.

Cita MLA

Villegas, Bernardo M., and Victor A. Abola. Economics: An Introduction. Sinag-Tala Pub, 1982.