Titmuss, Richard M.
University of Toronto Press , 1962
Buku Teks
National Council for Civil Liberties with Pluto Press, 1994
Buku Teks
Cook, Peter, 1936, author
St. Martin's Press, 1993
Buku Teks
Stone, Richard
Blackstone Press limited, 1997
Buku Teks
Warbasse, James Peter
N.Y. Barnes & Neble , 1946
Buku Teks