Perko, L. (1991). Differential equations and dynamical systems. Springer-Verlag.
Chicago Style aipamenaPerko, Lawrence. Differential Equations and Dynamical Systems. New York: Springer-Verlag, 1991.
MLA aipamenaPerko, Lawrence. Differential Equations and Dynamical Systems. Springer-Verlag, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.