Kirk, Kenneth L.
Plenum Press, 1991
Buku Teks
Shriner, Ralph Lloyd, 1899-1994, author
John Wiley & Sons, 1956
Buku Teks
Beyer, Hans, author
Prentice-Hall, 1996
Buku Referensi
Matthew David, Debora Halbert, editors
SAGE Publications, 2015
Buku Teks
Burby, William Edward, 1893-, author
West Publishing, 1954
Buku Teks