Kells, L. M. (1965). Elementary differential equations (6th ed.). McGraw-Hill.
Cita Chicago Style (17a ed.)Kells, Lyman M. Elementary Differential Equations. 6th ed. New York: McGraw-Hill, 1965.
Cita MLA (8a ed.)Kells, Lyman M. Elementary Differential Equations. 6th ed. McGraw-Hill, 1965.
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