Ilagan, A. R. (2012). Light and laughter underground: Puerto Princesa underwater river attracts large number of tourists. Cruising.
Čikaški stil citiranja (17. izdanje)Ilagan, Aris R. "Light and Laughter Underground: Puerto Princesa Underwater River Attracts Large Number of Tourists." Cruising 2012.
MLA način citiranja (9. izdanje)Ilagan, Aris R. "Light and Laughter Underground: Puerto Princesa Underwater River Attracts Large Number of Tourists." Cruising, 2012.
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