Calleja, D. O. (2000). Epidemya, mudflow: Mayon, may 2 panganib. Kabayan.
Tohutoru Kātū Chicago (17th ed.)Calleja, Danny O. "Epidemya, Mudflow: Mayon, May 2 Panganib." Kabayan 2000.
Tohutoro MLA (9th ed.)Calleja, Danny O. "Epidemya, Mudflow: Mayon, May 2 Panganib." Kabayan, 2000.
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