[publisher not identified], [date of publication not identified]
Naskah
Plucknett, Theodore Frank Thomas
At The University Press, 1958
Buku Teks
Arnstein, Walter L.
Head, 1983
Buku Teks
Barker, Ernest, author
Oxford University Press, 1942
Buku Teks
Himmelfarb, Gertrude
Weidenfeld and Nicolson,, 1968
Buku Teks