APA (7th ed.) Citation

Zill, D. G. (1993). A first course in differential equations (5. ed.). PWS Publ.

Chicago Style (17th ed.) Citation

Zill, Dennis G. A First Course in Differential Equations. 5. ed. Boston, Mass: PWS Publ, 1993.

MLA (9th ed.) Citation

Zill, Dennis G. A First Course in Differential Equations. 5. ed. PWS Publ, 1993.