Castles, L. (1973). The political life of a Sumatran residency: Tapanuli, 1915-1940. University Microfilms International.
Chicago Style (17. basım) AtıfCastles, Lance. The Political Life of a Sumatran Residency: Tapanuli, 1915-1940. Ann Arbor: University Microfilms International, 1973.
MLA (9th ed.) AtıfCastles, Lance. The Political Life of a Sumatran Residency: Tapanuli, 1915-1940. University Microfilms International, 1973.
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