Thomas, William E., author
South-Western Publishing, 1988
Buku Teks
Dearden, John, 1919-2004
Prentice-Hall, 1962
Buku Teks
Usry, Milton F., author
South Western, 1988
Buku Teks
Matz, Adolph, author
Ohio South-Western Publishing , 1967/1991
Buku Teks
Gillespie, Cecil, author
Prentice-Hall, 1957
Buku Teks