Athens, Lonnie H
Routledge, 1989
Buku Teks
Bawengan, Gerson W., author
Pradnya Paramita, 1991
Buku Teks
Hagan, Frank E., author
Sage Publications, 2010
Buku Teks
Godwin, Grover Maurice
CRC Press, 2000
Buku Teks
Reid, Sue Titus, author
Holt, Rinehart and Winston, 1985
Buku Teks