Selmann, R. R., author
Edward Arnold, 1953
Buku Referensi
Philips, author
Chancellor Press, 1999
Buku Referensi
Beckingham, C.F.
Macmillan & Co., 1960
Buku Referensi
Natkiel, Richard
Facts on Eile, 1986
Buku Referensi
Black, Jeremy, author
Cambridge University Press, 1996
Buku Referensi