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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.