Moran, Theodore H.
Resources for the Future, 1978
Buku Teks
Doran, Charles F., author
Free Press, 1977
Buku Teks
Departemen Penerangan
Departemen Penerangan, 1976
Buku Teks
Tanzer, Michael, author
Temple Smith, 1969
Buku Teks
Moran, Theodore H
Princeton University Press, 1974
Buku Teks