Villegas, B. M., & Abola, V. A. (1982). Economics: An introduction. Sinag-Tala Pub.
芝加哥风格引文Villegas, Bernardo M., 与 Victor A. Abola. Economics: An Introduction. Manila: Sinag-Tala Pub, 1982.
MLA引文Villegas, Bernardo M., 与 Victor A. Abola. Economics: An Introduction. Sinag-Tala Pub, 1982.
警告：这些引文格式不一定是100％准确.