Laird, Charlton Grant, 1901-
Fawcett World Library, 1957
Buku Teks
Bloomfield, Leonard
Holt, Rinehart and Winston, 1961
Buku Teks
Beard, Adrian
Routledge, 2004
Buku Teks
Klein, Wolfgang
Routledge , 1997
Buku Teks
edited by Joseph H. Greenberg
MIT Press, 1966
Buku Teks