Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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