Cushing, J. M. (2004). Differential equations. Pearson/Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Cushing, J. M. Differential Equations. Upper Saddle River, N.J: Pearson/Prentice Hall, 2004.
Lua MLA (8ú heag.)Cushing, J. M. Differential Equations. Pearson/Prentice Hall, 2004.
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