Zill, D. G. (2009). A first course in differential equations with modeling applications: /Dennis G. Zill (9th ed.). CA : Books/ Cole.
Chicago-viite (17. p.)Zill, Dennis G. A First Course in Differential Equations with Modeling Applications: /Dennis G. Zill. 9th ed. Belmont: CA : Books/ Cole, 2009.
MLA-viite (9. p.)Zill, Dennis G. A First Course in Differential Equations with Modeling Applications: /Dennis G. Zill. 9th ed. CA : Books/ Cole, 2009.
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