McQueen, Matthew
Weidenfeld & Nicolson, 1973
Buku Teks
Todaro, Michael P., author
Longman, 1992
Buku Teks
Staley, Eugene, author
Published for the Council on Foreign Relations by Harper, 1961
Buku Teks
Todaro, Michael P., author
Bumi Aksara, 1995
Buku Teks
Heilbroner, Robert L., author
Harper & Row , 1963
Buku Teks