Tanzer, Michael, author
Temple Smith, 1969
Buku Teks
Staley, Eugene, author
Published for the Council on Foreign Relations by Harper, 1961
Buku Teks
John Wiley and Sons, Inc, 1951
Buku Teks
Moran, Theodore H.
Resources for the Future, 1978
Buku Teks
Bhagwati, Jagdish, author
MIT Press, c1991
Buku Teks