Bibbero, Robert J., author
John Wiley & Sons, 1977
Buku Teks
Katz, Paul, author
Prentice-Hall, 1981
Buku Teks
Steckhahn, A.D., author
Reston Publishing, 1982
Buku Teks
Barney, George C., author
Prentice-Hall, 1985
Buku Teks
Barney, George C., author
Prentice-Hall, 1988
Buku Teks