Oppenheim, E. P. (1923). The seven conundrums. Little, Brown, and Co..
Chicagoスタイル(17版)引用形式Oppenheim, E. Phillips. The Seven Conundrums. Boston: Little, Brown, and Co., 1923.
MLA(8版)引用形式Oppenheim, E. Phillips. The Seven Conundrums. Little, Brown, and Co., 1923.
警告: この引用は必ずしも正確ではありません.