APA Style

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: Singapoe Universitas Press.

MLA Style

Warren, 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: Singapoe Universitas Press, 1981. Buku.