Trevelyan, George Macaulay, 1876-1962, author
Methuen, 1949
Buku Teks
Stroud, Angus, author
Routledge, 1999
Buku Teks
Trevelyan, George Macaulay, 1876-1962, author
Longmans, Green, 1948
Buku Teks
Stuart, Dorothy Margaret.
Macmillan, 1952
Buku Teks
Green, John Richard
New York The Co-operative Publication Society [t.th.]
Buku Teks