APA (7th ed.) Citation

Sagan, H. (1989). Boundary and eigenvalue problems in mathematical physics. Dover Publications.

Chicago Style (17th ed.) Citation

Sagan, Hans. Boundary and Eigenvalue Problems in Mathematical Physics. New York, N.Y: Dover Publications, 1989.

MLA (8th ed.) Citation

Sagan, Hans. Boundary and Eigenvalue Problems in Mathematical Physics. Dover Publications, 1989.

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