Levenson, Joseph R.
Harvard University Press, 1953
Buku Teks
Levenson, Joseph R.
University of California Press, 1965
Buku Teks
Morris, David, author
Houghton-Mifflin, 1949
Buku Teks
Agard, Walter A.
Van Nostrand Company, 1957
Buku Teks
Boulder Westview Press 1992,
Buku Teks