APA (7e ed.) Bronvermelding

Ilagan, A. R. (2012). Light and laughter underground: Puerto Princesa underwater river attracts large number of tourists. Cruising.

Chicago (17e ed.) Bronvermelding

Ilagan, Aris R. "Light and Laughter Underground: Puerto Princesa Underwater River Attracts Large Number of Tourists." Cruising 2012.

MLA (9e ed.) Bronvermelding

Ilagan, Aris R. "Light and Laughter Underground: Puerto Princesa Underwater River Attracts Large Number of Tourists." Cruising, 2012.