Spoehr, A. (1973). Zamboanga and Sulu: An archaeological approach to ethnic diversity. Dept. of Anthropology, University of Pittsburgh.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpoehr, Alexander. Zamboanga and Sulu: An Archaeological Approach to Ethnic Diversity. Pittsburgh, Pa: Dept. of Anthropology, University of Pittsburgh, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSpoehr, Alexander. Zamboanga and Sulu: An Archaeological Approach to Ethnic Diversity. Dept. of Anthropology, University of Pittsburgh, 1973.
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