Graham, J., & Oliver, G. A. S. (1904). German commercial practice connected with the export and import trade to and from Germany: The German colonies, and the countries where German is the recognised language of commerce. Macmillan.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিGraham, James, এবং George A. S. Oliver. German Commercial Practice Connected with the Export and Import Trade to and from Germany: The German Colonies, and the Countries Where German Is the Recognised Language of Commerce. London, New York: Macmillan, 1904.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিGraham, James, এবং George A. S. Oliver. German Commercial Practice Connected with the Export and Import Trade to and from Germany: The German Colonies, and the Countries Where German Is the Recognised Language of Commerce. Macmillan, 1904.