De Villa, J. G. (1988). Philippine vacations and explorations. Devcon I.P.
Chicagoスタイル(17版)引用形式De Villa, Jill Gale. Philippine Vacations and Explorations. Manila: Devcon I.P, 1988.
MLA(9版)引用形式De Villa, Jill Gale. Philippine Vacations and Explorations. Devcon I.P, 1988.
警告: この引用は必ずしも正確ではありません.