Jarman, Colin, author
Guinness Publishing, 1991
Buku Referensi
Bloomsbury, 1990
Buku Referensi
Sharpe, Gareth, author
Guinness Publishing, 1994
Buku Referensi
consultant ed. Tanya A. McFerran
Oxford University Press, 1996
Buku Referensi
Cohen, J.M. (John Michael), 1903-1989, author
Viking, 1993
Buku Referensi