Kelly, Gary F.
The Dushkin Publishing Group, 1992
Buku Teks
Mary C. Burke, editor
Routledge, Taylor & Francis Group, 2018
Buku Teks
Kail, Robert V., author
W.H. Freeman, c1985
Buku Teks
Jeff Malpas
Springer, 2012
eBooks
Sergiovanni, Thomas J., author
McGraw-Hill, 1983
Buku Teks