APA (7 वां संस्करण) प्रशस्ति पत्र

(1998). RP has most of world's endangered mammals. Philippine Star.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

"RP Has Most of World's Endangered Mammals." Philippine Star 1998.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

"RP Has Most of World's Endangered Mammals." Philippine Star, 1998.