The Commercial Press, 1939
Buku Teks
edited by P. J. Failes
Associated Magazines, 1987
Buku Referensi
England. Cabinet Office
Her Majesty's Stationery Office, 1989
Buku Referensi
The Salvation Army, 2002
Buku Referensi
England. Cabinet Office
Her Majesty's Stationery Office, 1988
Buku Referensi