Schubert, H. C. H. (1917). Mathematical essays and recreations. The Open Court.
Chicagoスタイル(17版)引用形式Schubert, Hermann C. H. Mathematical Essays and Recreations. Chicago: The Open Court, 1917.
MLA(9版)引用形式Schubert, Hermann C. H. Mathematical Essays and Recreations. The Open Court, 1917.
警告: この引用は必ずしも正確ではありません.