Buergenthal, Thomas
Syracuse University Press, 1969
Buku Teks
Milde, Michael
Eleven Pub , 2012
Buku Teks
Weber, Ludwig
Wolters Kluwer, 2007
Buku Teks
Thielen, J.E.D.M.
A. Jongbloed & Zoon, [1965]
Buku Teks
Eagleton, Clyde
The Ronald Press, 1948
Buku Teks