Brady, Alexander, author
University of Toronto Press, 1948
Buku Teks
Maarseveen, Henc van
Oceana Publications,Inc., 1978
Buku Teks
National Unification Board, 1988
Buku Teks
Zoller, Elisabeth, author
Martinus Nijhoff, 2008
Buku Teks
Otto Eduardo Fonseca Lobo
Carswell , 2009
Buku Teks