APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Sagan, Hans. Boundary and Eigenvalue Problems in Mathematical Physics. Repr. New York: Dover Publ, 1989.

MLA (9th ed.) Citation

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

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