APA-referens

Appell, J. (2004). Nonlinear spectral theory. Walter de Gruyter.

Chicago-stil citat

Appell, Jurgen. Nonlinear Spectral Theory. New York: Walter de Gruyter, 2004.

MLA-referens

Appell, Jurgen. Nonlinear Spectral Theory. Walter de Gruyter, 2004.