APA (7th ed.) Citation
Waltman, P. (1986). A second course in elementary differential equations. Academic press.
Chicago Style (17th ed.) Citation
Waltman, Paul. A Second Course in Elementary Differential Equations. Orlando: Academic press, 1986.
MLA (9th ed.) Citation
Waltman, Paul. A Second Course in Elementary Differential Equations. Academic press, 1986.
Warning: These citations may not always be 100% accurate.