Asa S. Knowles, editor-in-chief.
McGraw-Hill, 1970
Buku Referensi
Buku Referensi
Balderston, Frederick E.
Jossey-Bass , 1974
Buku Teks
Mizamil, author
Universitas Indonesia, 2005
UI - Tesis (Membership)
Eble, Kenneth E., author
Jossey-Bass, 1978
Buku Referensi