Kollmann, Nancy Shields
Oxford University Press, 2017
eBooks
Slonim, Marc
Collier Books, 1962
Buku Teks
Dworkin, Ronald
Harvard University Press, 1986
Buku Teks
Griffiths, Percival, Sir, 1899-
Ernest Benn, 1969
Buku Teks
Ohara, Daniel T
Duke University Press, 2003
Buku Teks