Keeton, George W., 1902-1989, author
Sir Isaac Pitman and Sons, 1950
Buku Teks
Haley, Michael, author
Sweet and Maxwell, 2007
Buku Teks
Grove, J.M.
Longmans, 1962
Buku Teks
Titmuss, Richard M.
University of Toronto Press , 1962
Buku Teks
Scott, Austin Wakeman, 1884-1981, author
Little, Brown, 1966
Buku Teks