APA (7th ed.) Citation

Oppenheim, E. P. (1923). The seven conundrums. Little, Brown, and Co..

Chicago Style (17th ed.) Citation

Oppenheim, E. Phillips. The Seven Conundrums. Boston: Little, Brown, and Co., 1923.

MLA (8th ed.) Citation

Oppenheim, E. Phillips. The Seven Conundrums. Little, Brown, and Co., 1923.