APA (7th ed.) Citation

Zill, D. G. (1989). Differential equations with boundary-value problems (2. ed.). PWS-Kent.

Chicago Style (17th ed.) Citation

Zill, Dennis G. Differential Equations with Boundary-value Problems. 2. ed. Boston: PWS-Kent, 1989.

MLA (9th ed.) Citation

Zill, Dennis G. Differential Equations with Boundary-value Problems. 2. ed. PWS-Kent, 1989.