Bortolotti, Lisa, author
Polity Press, 2008
Buku Teks
Stathis Psillos, Martin Curd, editor
Routledge, 2008
Buku Teks
Farrukh, OA
Beirut Al-Kashaf-Press 1952
Buku Teks
Padovan, Richard, author
E&FN Spon, 1999
Buku Teks
Cohen, Morris R.
Henry Holt and Company, 1949
Buku Teks