Philippines. Department of Tourism. Planning Services. Plans and Programs Division. (1993). Study on regional travel in the Philippines: Household survey on travel patterns of Philippine residents 1993. DOT/AIT.
Chicago-referens (17:e uppl.)Philippines. Department of Tourism. Planning Services. Plans and Programs Division. Study on Regional Travel in the Philippines: Household Survey on Travel Patterns of Philippine Residents 1993. [Quezon City]: DOT/AIT, 1993.
MLA-referens (9:e uppl.)Philippines. Department of Tourism. Planning Services. Plans and Programs Division. Study on Regional Travel in the Philippines: Household Survey on Travel Patterns of Philippine Residents 1993. DOT/AIT, 1993.
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