Nagle, R. K., Saff, E. B., & Snider, A. D. (2000). Fundamentals of differential equations and boundary value problems (4th ed.). Boston: Pearson Education, Inc.
Παραπομπή Chicago StyleNagle, R. Kent, Edward B. Saff, and Arthur David Snider. Fundamentals of Differential Equations and Boundary Value Problems. 4th ed. Boston: Pearson Education, Inc, 2000.
Παραπομπή MLANagle, R. Kent, Edward B. Saff, and Arthur David Snider. Fundamentals of Differential Equations and Boundary Value Problems. 4th ed. Boston: Pearson Education, Inc, 2000.
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