Warren, J. F. (1981). The Sulu zone, 1768-1898: The dynamics of external trade, slavery, and ethnicity in the transformation of a Southeast Asian maritime state. Singapore University Press.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিWarren, James Francis. The Sulu Zone, 1768-1898: The Dynamics of External Trade, Slavery, and Ethnicity in the Transformation of a Southeast Asian Maritime State. Singapore University Press, 1981.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিWarren, James Francis. The Sulu Zone, 1768-1898: The Dynamics of External Trade, Slavery, and Ethnicity in the Transformation of a Southeast Asian Maritime State. Singapore University Press, 1981.
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