Prentice-Hall, 1976
Buku Teks
Stanley, Joyce, 1901-, author
Warren, Gorham and Lamont, 1971
Buku Teks
Dodge, Joseph M., 1941-, author
Michie, 1995
Buku Teks
Gaffney, Dennis J., author
McGraw-Hill, 1982
Buku Teks
Hudson, David M., author
St. Paul, Minn, 1994
Buku Teks