Gutteridge, Anne C.
Cambridge University Press, 1983
Buku Referensi
edited by Geoffrey Parker
Cambridge University Press, 1995
Buku Referensi
Porter, Roy, 1946-2002
Cambridge University Press, 1996
Buku Referensi
edited by Michael Hoskin
Cambridge University Press, 1997
Buku Referensi
George Philip & O'Neil, 1981
Buku Referensi