Schult, V. (2000). Sulu and Germany in the late nineteenth century. Philippine Studies.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchult, Volker. "Sulu and Germany in the Late Nineteenth Century." Philippine Studies 2000.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSchult, Volker. "Sulu and Germany in the Late Nineteenth Century." Philippine Studies, 2000.
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