Kuczma, M., Choczewski, B., & Ger, R. [ca. 1990]. Iterative functional equations. In Encyclopedia of mathematics and its applications [Book]. Cambridge [u.a.]: Cambridge Univ. Press.

KUCZMA, Marek, CHOCZEWSKI, Bogdan und GER, Roman, 1990. Iterative functional equations. Cambridge [u.a.]: Cambridge Univ. Press. Encyclopedia of mathematics and its applications, 32. ISBN 0521355613.

Kuczma, M., B. Choczewski, und R. Ger. „Iterative functional equations“. Encyclopedia of mathematics and its applications, book, Cambridge Univ. Press, 1990.

Kuczma, Marek/Choczewski, Bogdan/Ger, Roman: Iterative functional equations, . Encyclopedia of mathematics and its applications, Cambridge [u.a.] 1990.

Kuczma, M., Choczewski, B. und Ger, R. (1990), Iterative functional equations, Encyclopedia of mathematics and its applications, Bd. , Cambridge Univ. Press, Cambridge [u.a.].