Levenson, Joseph R.
University of California Press, 1965
Buku Teks
Morris, David
Houghton-Mifflin, 1949
Buku Teks
Agard, Walter A.
Van Nostrand Company, 1957
Buku Teks
Boulder Westview Press 1992,
Buku Teks
Shoenfield, Joseph R.
Springer-Verlag, 1993
Buku Teks