Warren, J. F. (2000). The global economy and the Sulu zone: Connections, commodities and culture (Philippine edition.). New Day Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWarren, James Francis. The Global Economy and the Sulu Zone: Connections, Commodities and Culture. Philippine edition. Quezon City: New Day Publishers, 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWarren, James Francis. The Global Economy and the Sulu Zone: Connections, Commodities and Culture. Philippine edition. New Day Publishers, 2000.
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