Knaap, Gerrit (1999). "Shipping and Trade in Java, c. 1775: A Quantitative Analysis". Modern Asian Studies. 33 (2): 405–420. doi:10.1017/S0026749X99003078. S2CID154992308.
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Knaap, Gerrit (1999). "Shipping and Trade in Java, c. 1775: A Quantitative Analysis". Modern Asian Studies. 33 (2): 405–420. doi:10.1017/S0026749X99003078. S2CID154992308.