Bowden, Edwin T.
Holt, Rinehart and Winston, 1963
Buku Teks
Geoffrey, Leech N.
Longmans, 1993
Buku Teks
Sandell, Rolf
Academic Press, 1977
Buku Teks
Vendryes, J. (Joseph), 1875-1960
Routledge, 1996
Buku Teks
Sturtevant, Edgar H.
Yale University Press, 1947
Buku Teks