Kymlicka, Will, author
Clarendon Press, 1990
Buku Teks
Sargent, Lyman Tower, author
Brooks Cole, 1990
Buku Teks
Fried, Robert C., author
Macmillan, 1968
Buku Teks
Hague, Rod., author
Palgrave Macmillan , 2013
Buku Teks
Ford, Donald H.
John Wiley & Sons, 1998
Buku Teks