Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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