editor by. Brian L. Cutler
Sage, 2008
Buku Referensi
Wrightsman, Lawrence S., author
Brooks/Cole, 1991
Buku Teks
Wrightsman, Lawrence S., author
Brooks/Cole , 1998
Buku Teks
Grover Maurice Godwin, editor
CRC press, 2001
Buku Teks
Wrightsman, Lawrence S., author
Wadsworth/Thomson Learning, 2001
Buku Teks