O`Donnell, Paul D., author
Prentice-Hall, 1954
Buku Teks
Biegel, John E., author
Prentice-Hall, 1980
Buku Teks
Riggs, James L., author
John Wiley & Sons, 1987
Buku Teks
Riggs, James L., author
John Wiley & Sons, 1970
Buku Teks
Rage, Louis J., author
Scranton, Penn., International Textbook
Buku Teks