Trebilcock, Michael
Routledge, 2013
Buku Teks
edited by Marion Panizzon, Nicole Pohl, Pierre Sauve
Cambridge University Press, 2008
Buku Teks
Fulda, Carl H.
Foundation Press, 1970
Buku Teks
McGovern, Edmond
Globefield Press, 1982
Buku Teks
Bhagwati, Jagdish
Penguin Books, 1969
Buku Teks