abdel karim, a. i. (1964). difference equations. the institute of national planning.
芝加哥风格引文abdel karim, abbas i. Difference Equations. cairo: the institute of national planning, 1964.
MLA引文abdel karim, abbas i. Difference Equations. the institute of national planning, 1964.
警告：这些引文格式不一定是100％准确.