Norwich, John Julius, editor
Oxford University Press, 1990
Buku Referensi
edited by Robin Osborne and Jeremy Tanner
Blackwell Publishing, 2007
Buku Teks
Porter, Philip
Haynes, 1995
Buku Referensi
Singh, Khuswant
Oxford University Press, 2006
Buku Teks
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi