Bonesteel, M. (2013). Dead or alive? The Outsider, 18, 26–28.
Gomez, E. (2014a, May). Blurring Boundaries. Art & Antiques.
Gomez, E. (2014b, June 28). In “self-taught genius,” a history of label-teasing art forms. Hyperallergic.
Oke, W. (2004, April). An artistic pioneer: Alma Rumball, pioneer in art and in spirit. Alma Matters.
Rainaldi, L. (2016). Thesis dissertation, UBC: Outsider Art – Forty Years Out.
Smith, R. (2007, January 26). Outside in. New York Times.
Volkersz, W. (1998, Spring). Roger Cardinal on outsider art. Raw Vision, pp. 24–29.