Desimone, Randy L.
South Western Cengage Learning, 2012
Buku Teks SO
Megginson, David
Kogan Page, 1999
Buku Teks SO
Yeh, Stephen H.K.
UNESCO, 1990
Buku Teks
Harbison, Frederick Harris
International Institute for Educational Planning Unesco , 1967
Buku Teks
Koike, Kazuo
The Japan Institute of Labour , 1997
Buku Teks SO