Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.