Cita APA (7th ed.)
Appell, J., De Pascale, E., & Vignoli, A. (2004). Nonlinear spectral theory. Walter de Gruyter.
Cita Chicago (17th ed.)
Appell, Jürgen, Espedito De Pascale, i Alfonso Vignoli. Nonlinear Spectral Theory. Berlin ; New York: Walter de Gruyter, 2004.
Cita MLA (9th ed.)
Appell, Jürgen, et al. Nonlinear Spectral Theory. Walter de Gruyter, 2004.
Atenció: Aquestes cites poden no estar 100% correctes.