Eble, Kenneth E., author
Jossey-Bass, 1978
Buku Referensi
Bauer, Ronald C., author
Teachers College, Columbia University, 1955
Buku Teks
Tellefsen, Thomas E., author
Jossey-Bass, 1990
Buku Teks
UI-Press, 1983
UI - Publikasi
UI-Press, 2002
UI - Publikasi