Singh, Khushwant
Oxford University Press., 1999
Buku Teks
Porter, Philip
Haynes, 1995
Buku Referensi
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi
editor, John Prest
Oxford University Press, 1993
Buku Referensi
Porter, Roy, 1946-2002
Cambridge University Press, 1996
Buku Referensi