State of the world 1990 : a worldwatch institute report on progress toward a sustainable society
Lester R. Brown ...[et al.]
W.W. Norton, 1990
 Buku Teks
Trade policy review : Indonesia Volume I
General Agreement on Tariffs and Trade, 1995
 Buku Teks
Trade policy review : Indonesia Volume II
General Agreement on Tariffs and Trade, 1995
 Buku Teks
Cubbage, Frederick W.
Forest resource policy
John Wiley & Sons, 1993
 Buku Teks
Energy policies and programmes of IEA Countries : review / International Energy Agency
Organisation for Economic Cooperation and Development, 1982
 Buku Teks