APA (7th ed.) Citation

Villegas, B. M., & Abola, V. A. (2001). Economics: An introduction (Fifth edition.). Center for Research and Communication Foundation, Inc.

Chicago Style (17th ed.) Citation

Villegas, Bernardo M., and Victor A. Abola. Economics: An Introduction. Fifth edition. [Place of publication not identified]: Center for Research and Communication Foundation, Inc, 2001.

MLA (9th ed.) Citation

Villegas, Bernardo M., and Victor A. Abola. Economics: An Introduction. Fifth edition. Center for Research and Communication Foundation, Inc, 2001.