एपीए उद्धरण

Perko, L. (1991). Differential equations and dynamical systems. Springer-Verlag.

शिकागो स्टाइल उद्धरण

Perko, Lawrence. Differential Equations and Dynamical Systems. New York: Springer-Verlag, 1991.

एमएलए उद्धरण

Perko, Lawrence. Differential Equations and Dynamical Systems. Springer-Verlag, 1991.