APA (7 वां संस्करण) प्रशस्ति पत्र

Del Castillo, L. B. (2002). Environmental management now a must due to globalization. Manila Times.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Del Castillo, Leah B. "Environmental Management Now a Must Due to Globalization." Manila Times 2002.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Del Castillo, Leah B. "Environmental Management Now a Must Due to Globalization." Manila Times, 2002.