APA-referens (7:e uppl.)

THARP, R. G., & WETZEL, R. J. (1969). Behavior modification in the natural environment. Academic Press.

Chicago-referens (17:e uppl.)

THARP, Roland G., och Ralph J. WETZEL. Behavior Modification in the Natural Environment. New York: Academic Press, 1969.

MLA-referens (9:e uppl.)

THARP, Roland G., och Ralph J. WETZEL. Behavior Modification in the Natural Environment. Academic Press, 1969.