Zill, D. G., Wright, W. S., & Cullen, . M. R. (2013). Differential equations with boundary-value problems (Eight edition.). Brooks/Cole Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Zill, Dennis G., Warren S. Wright, agus Michael R. Cullen. Differential Equations with Boundary-value Problems. Eight edition. Australia: Brooks/Cole Cengage Learning, 2013.
Lua MLA (8ú heag.)Zill, Dennis G., et al. Differential Equations with Boundary-value Problems. Eight edition. Brooks/Cole Cengage Learning, 2013.
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