(1989). Study on regional travel in the Philippines 1989. DOT/AIT.
Chicagoスタイル(17版)引用形式Study on Regional Travel in the Philippines 1989. [Quezon City]: DOT/AIT, 1989.
MLA(9版)引用形式Study on Regional Travel in the Philippines 1989. DOT/AIT, 1989.
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