Kells, L. M. (1965). Elementary differential equations (6th ed.). McGraw-Hill Book Co., Inc.
芝加哥风格引文Kells, Lyman Morse. Elementary Differential Equations. 6th ed. New York: McGraw-Hill Book Co., Inc, 1965.
MLA引文Kells, Lyman Morse. Elementary Differential Equations. 6th ed. McGraw-Hill Book Co., Inc, 1965.
警告：这些引文格式不一定是100％准确.