Polking, J. (2006). Differential equations. New Jersey: Pearson Prentice Hall.
Trích dẫn kiểu ChicagoPolking, John. Differential Equations. New Jersey: Pearson Prentice Hall, 2006.
Deismireacht MLAPolking, John. Differential Equations. New Jersey: Pearson Prentice Hall, 2006.
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