Cox, Harold, author
Prentice-Hall, 1984
Buku Teks
Ferrini, Rebecca, author
McGraw-Hill, 2013
Buku Teks
Dworkin, Ronald
Harvard University Press, 1986
Buku Teks
Griffiths, Percival, Sir, 1899-, author
Ernest Benn, 1969
Buku Teks
Ohara, Daniel T, author
Duke University Press, 2003
Buku Teks