White, P.A.F., author
Macmillan, 1975
Buku Teks
Jossey-Bass Inc., Publishers, 1990
Buku Teks
Harris, Myra A., author
Prentice-Hall, 1997
Buku Teks
Campbell, Enid Mona, author
The Law Book, 1967
Buku Teks
Bander, Edward J., author
Balinger, 1978
Buku Teks