Zill, D. G. (1993). A first course in differential equations (5th edition.). PWS-KENT Publishing Company.
Chicago Style (17th ed.) CitationZill, Dennis G. A First Course in Differential Equations. 5th edition. Boston, Massachusetts: PWS-KENT Publishing Company, 1993.
MLA (9th ed.) CitationZill, Dennis G. A First Course in Differential Equations. 5th edition. PWS-KENT Publishing Company, 1993.
Warning: These citations may not always be 100% accurate.