APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.