Moran, Theodore H
Princeton University Press, 1974
Buku Teks
Moran, Theodore H.
Resources for the Future, 1978
Buku Teks
Lowi, Theodore J.
Basic books, 1971
Buku Teks
Beer, Samuel H., author
Faber and Faber, 1971
Buku Teks
Epstein, A.L., author
Australian Univ. Press, 1971
Buku Teks