Harris, Myra A., author
Prentice-Hall, 1997
Buku Teks
Myers, John G., author
Prentice-Hall, 1980
Buku Teks
Bander, Edward J., author
Balinger, 1978
Buku Teks
Cohen, Morris L., author
West Publishing, 1968
Buku Teks
Carrol, John
Harvard University Press , 1953
Buku Teks