Παραπομπή APA

Struwe, M. (1990). Variational methods. Springer-Verlag.

Παραπομπή Chicago Style

Struwe, Michael. Variational Methods. Berlin: Springer-Verlag, 1990.

Παραπομπή MLA

Struwe, Michael. Variational Methods. Springer-Verlag, 1990.