APA (7 वां संस्करण) प्रशस्ति पत्र

(1997). Pinoy inventions environment-friendly. Manila Times.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

"Pinoy Inventions Environment-friendly." Manila Times 1997.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

"Pinoy Inventions Environment-friendly." Manila Times, 1997.