APA (7th ed.) Citation

Rellich, F. (1969). Perturbation theory of eigenvalue problems. Gordon and Breach Science Publishers.

Chicago Style (17th ed.) Citation

Rellich, Franz. Perturbation Theory of Eigenvalue Problems. New York: Gordon and Breach Science Publishers, 1969.

MLA (9th ed.) Citation

Rellich, Franz. Perturbation Theory of Eigenvalue Problems. Gordon and Breach Science Publishers, 1969.

Warning: These citations may not always be 100% accurate.