APA (7th ed.) Citation

Knopp, K. (1948). Problem book in the theory of functions. Dover Publications.

Chicago Style (17th ed.) Citation

Knopp, Konrad. Problem Book in the Theory of Functions. New York: Dover Publications, 1948.

MLA (9th ed.) Citation

Knopp, Konrad. Problem Book in the Theory of Functions. Dover Publications, 1948.