Dela Cruz, C. L. N. (2016). Perceived economic impacts of new seven wonders of nature award by the tourism establishments in Puerto Princesa City. UP Asian Institute of Tourism.
Chicago-viite (17. p.)Dela Cruz, Carl Louis N. Perceived Economic Impacts of New Seven Wonders of Nature Award by the Tourism Establishments in Puerto Princesa City. Quezon City: UP Asian Institute of Tourism, 2016.
MLA-viite (9. p.)Dela Cruz, Carl Louis N. Perceived Economic Impacts of New Seven Wonders of Nature Award by the Tourism Establishments in Puerto Princesa City. UP Asian Institute of Tourism, 2016.
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