Cita APA (7th ed.)

Knopp, K., Bers, L., & Bagemihl, F. (1948). Problem book in the theory of functions (First American edition.). Dover Publications, Inc.

Cita Chicago (17th ed.)

Knopp, Konrad, L. Bers, i F. Bagemihl. Problem Book in the Theory of Functions. First American edition. New York: Dover Publications, Inc, 1948.

Cita MLA (9th ed.)

Knopp, Konrad, et al. Problem Book in the Theory of Functions. First American edition. Dover Publications, Inc, 1948.