De Villa, J. G. (1988). Philippine vacations and explorations. Devcon I.P.
芝加哥风格引文De Villa, Jill Gale. Philippine Vacations and Explorations. Manila: Devcon I.P, 1988.
MLA引文De Villa, Jill Gale. Philippine Vacations and Explorations. Devcon I.P, 1988.
警告：这些引文格式不一定是100％准确.