National Planning Institute. (1980). a study on development of the egyptian national fleet. National Planning Institute،.
芝加哥风格引文National Planning Institute. A Study on Development of the Egyptian National Fleet. cairo: National Planning Institute،, 1980.
MLA引文National Planning Institute. A Study on Development of the Egyptian National Fleet. National Planning Institute،, 1980.
警告：这些引文格式不一定是100％准确.