LeMay, Harold
Facts on File, 1988
Buku Referensi
Tulloch, Sara
Oxford University Press, 1991
Buku Teks
edited by John Algeo
Cambridge University Press, 1993
Buku Referensi
Palmer, E.H.B.
W. Foulsham, [1955]
Buku Referensi
Newmark, Maxim
New York : Philosophical Library, 1950
Buku Referensi