Scott, Mark C., author
John Wiley & Sons, 2005
Buku Teks
Coombs, Philip H., author
Johns Hopkins University Press, 1974
Buku Teks
Coombs, Philip H., author
John Hopkins University Press, 1988
Buku Teks
Deverell, C.S., author
London, Gee & Co
Buku Teks
Dacey, John S., author
Jossey-Bass Inc, 2000
Buku Teks