Derrick, W. R., & Grossman, S. I. (1976). Elementary differential equations with applications (World student series ed.). Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Derrick, William R., agus Stanley I. Grossman. Elementary Differential Equations with Applications. World student series ed. Reading, Mass: Addison-Wesley, 1976.
Lua MLA (9ú heag.)Derrick, William R., agus Stanley I. Grossman. Elementary Differential Equations with Applications. World student series ed. Addison-Wesley, 1976.
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