Butt, S. A. (1985). Essentials of commerce in East Africa (5th ed.). Cassell publishing limited.
芝加哥风格引文Butt, Safdar Ali. Essentials of Commerce in East Africa. 5th ed. London: Cassell publishing limited, 1985.
MLA引文Butt, Safdar Ali. Essentials of Commerce in East Africa. 5th ed. Cassell publishing limited, 1985.
警告：这些引文格式不一定是100％准确.