APA (7th ed.) Citation

Butler, S., Hartog, M. M., Hering, E., & Hartmann, E. v. (1920). Unconscious memory ((3d ed.).). Cape.

Chicago Style (17th ed.) Citation

Butler, Samuel, Marcus Manuel Hartog, Ewald Hering, and Eduard von Hartmann. Unconscious Memory. (3d ed.). London: Cape, 1920.

MLA (9th ed.) Citation

Butler, Samuel, et al. Unconscious Memory. (3d ed.). Cape, 1920.