Raz, Joseph
Clarendon Press, 1979
Buku Teks
Fuller, Lon L.
Yale University Press, 1974
Buku Teks
Fuller, Lon L.
Yale University Press, 1964
Buku Teks
Spinello, Richard A.
Jones and Bartlett Learning, 2017
Buku Teks
Hart, H.L.A.
Standford University Press, 1969
Buku Teks