Barker, Ernest, Sir, 1874-1960
Oxford University Press, 1942
Buku Teks SO
Himmelfarb, Gertrude
Weidenfeld and Nicolson,, 1968
Buku Teks SO
edited by Christopher Pawling
Macmillan, 1984
Buku Teks SO
Hobday, Peter
Priory Press, 1976
Buku Teks
Stuart, Dorothy Margaret
Methuen & Co. Ltd., 1956
Buku Teks SO