Vinuales, Jorge E.
Cambridge University Press, 2012
Buku Teks
Birnie, Patricia W.
Clarendon Press, 1995
Buku Teks
Birnie, Patricia
Oxford Univesity Press, 2009
Buku Teks
Sornarajah, M.
Cambridge University Press, 2017
Buku Teks
Schill, Stephan W.
Cambridge University press, 2009
Buku Teks