Knopp, K. (1952). Problem book in the theory of functions. Dover Publications.
芝加哥风格引文Knopp, Konrad. Problem Book in the Theory of Functions. New York: Dover Publications, 1952.
MLA引文Knopp, Konrad. Problem Book in the Theory of Functions. Dover Publications, 1952.
警告：这些引文格式不一定是100％准确.