Lewis, M. M.
Social Sciences Publisher, 1948
Buku Teks
Lewis, Bermnard
University of Chicago Press, 1988
Buku Teks
New York : Cambridge University Press
Majalah, Jurnal, Buletin
Malmstrom, Jean, author
Hayden Book Company, 1965
Buku Teks
Bram, Joseph, author
Random House, 1955
Buku Teks