Verhulst, F. (1989). Non-linear differential equations and dynamical systems. Springer- Verlag.
Dyfyniad Arddull ChicagoVerhulst, Ferdinard. Non-linear Differential Equations and Dynamical Systems. New York: Springer- Verlag, 1989.
Dyfyniad MLAVerhulst, Ferdinard. Non-linear Differential Equations and Dynamical Systems. Springer- Verlag, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.