Cash, Allen J., author
The Automobile Association, 1987
Buku Referensi
Gooch, R.K. (Robert Kent), 1893-1982, author
D. Van Nostrad, 1937
Buku Teks
Stroud, Angus, author
Routledge, 1999
Buku Teks
Trevelyan, George Macaulay, 1876-1962, author
Longmans, Green, 1945
Buku Teks
Bindoff, S.T., author
Penguin Books, 1951
Buku Teks