Whittaker, E.T.
Cambridge University Press, 1965
Buku Teks
Harman, Harry H., author
University of Chicago Press, 1968
Buku Teks
Blackwell, 2005
Buku Teks
Hummel, James A., author
Addison-Wesley , 1967
Buku Teks
Hockett, Charles F.
Macmillan, 1958
Buku Teks