APA (7th ed.) Citation

Kreyszig, E. (1989). Introductory functional analysis with applications. Wiley.

Chicago Style (17th ed.) Citation

Kreyszig, Erwin. Introductory Functional Analysis with Applications. New York: Wiley, 1989.

MLA (9th ed.) Citation

Kreyszig, Erwin. Introductory Functional Analysis with Applications. Wiley, 1989.