APA-referens (7:e uppl.)

Pressensé, E. d., & Holmden, A. H. (1893). A study of origins, or, The problems of knowledge, of being and of duty. James Pott & Co..

Chicago-referens (17:e uppl.)

Pressensé, Edmond de, och Annie Harwood Holmden. A Study of Origins, or, The Problems of Knowledge, of Being and of Duty. New York: James Pott & Co., 1893.

MLA-referens (8:e uppl.)

Pressensé, Edmond de, och Annie Harwood Holmden. A Study of Origins, or, The Problems of Knowledge, of Being and of Duty. James Pott & Co., 1893.