APA-referens

Halmos, P. R. (1974). Hilbert space problem book. Springer-Verlag.

Chicago-stil citat

Halmos, Paul R. Hilbert Space Problem Book. New York: Springer-Verlag, 1974.

MLA-referens

Halmos, Paul R. Hilbert Space Problem Book. Springer-Verlag, 1974.