Jansen, Marius B.
Rand Mc.Nally College Publishing , 1975
Buku Teks SO
Foreign Languages Press, 1950
Buku Teks SO
Moorad, George
E.P. Duttom, 1949
Buku Teks SO
Saric, Sasa
Springer, 2012
eBooks
by World Trade Organization
Centre William Rappard, 1999
Buku Teks