APA (7th ed.) Citation

Villegas, B. M., & Abola, V. A. (1977). Economics: An introduction (2nd ed.). Sinag-Tala.

Chicago Style (17th ed.) Citation

Villegas, Bernardo M., and Victor A. Abola. Economics: An Introduction. 2nd ed. Manila: Sinag-Tala, 1977.

MLA (9th ed.) Citation

Villegas, Bernardo M., and Victor A. Abola. Economics: An Introduction. 2nd ed. Sinag-Tala, 1977.