APA (7e ed.) Bronvermelding

Hughes, G. (1976). Let's keep it simple. National Ultreya Publications.

Chicago (17e ed.) Bronvermelding

Hughes, Gerry. Let's Keep It Simple. Dallas, TX: National Ultreya Publications, 1976.

MLA (8e ed.) Bronvermelding

Hughes, Gerry. Let's Keep It Simple. National Ultreya Publications, 1976.