APA-referens (7:e uppl.)

Tromp, M. (2006). Altered states: Sex, nation, drugs, and self-transformation in Victorian spiritualism. State University of New York Press.

Chicago-referens (17:e uppl.)

Tromp, Marlene. Altered States: Sex, Nation, Drugs, and Self-transformation in Victorian Spiritualism. Albany: State University of New York Press, 2006.

MLA-referens (9:e uppl.)

Tromp, Marlene. Altered States: Sex, Nation, Drugs, and Self-transformation in Victorian Spiritualism. State University of New York Press, 2006.