Gaya APA
Schwitzgebel, R, K., Kolb, D, A. (1974).
Changing human behavior principles of planned intervention .
Singapore:
McGraw-Hill.
Gaya MLA
Schwitzgebel, Ralph, K.., Kolb, David, A..
"Changing human behavior principles of planned intervention".
Singapore:
McGraw-Hill,
1974.
Text.