Knopp, K. (1948). Problem book in the theory of functions. Dover Publ.
芝加哥风格引文Knopp, Konrad. Problem Book in the Theory of Functions. New York, NY: Dover Publ, 1948.
MLA引文Knopp, Konrad. Problem Book in the Theory of Functions. Dover Publ, 1948.
警告：这些引文格式不一定是100％准确.