Zill, D. G. (1989). A first course in differential equations with applications (Fourth edition.). PWS-Kent.
Cita Chicago Style (17a ed.)Zill, Dennis G. A First Course in Differential Equations with Applications. Fourth edition. Boston: PWS-Kent, 1989.
Cita MLA (8a ed.)Zill, Dennis G. A First Course in Differential Equations with Applications. Fourth edition. PWS-Kent, 1989.
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