APA način citiranja (7. izdanje)

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

Čikaški stil citiranja (17. izdanje)

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

MLA način citiranja (8. izdanje)

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