Stiffler, A. Kent, author
McGraw-Hill, 1992
Buku Teks
Bibbero, Robert J., author
John Wiley & Sons, 1977
Buku Teks
Steckhahn, A.D., author
Reston Publishing, 1982
Buku Teks
Lorin, Harold, author
John Wiley & Sons, 1982
Buku Teks
Mano, M. Morris, 1927-, author
Prentice-Hall, 1982
Buku Teks