Hart, H.L.A., author
Standford University Press, 1969
Buku Teks
Kelly, Paul J., author
Oxford University Press, 1990
Buku Teks
Lyons, David, author
Clarendon Press, 1991
Buku Teks
Portnoy, Ethel
Meulenhoff, 1998
Buku Teks
edited by Leslie A. Fiedler
Thomas Y. Crowell, 1958
Buku Teks