Harrod, R.F., author
Macmillan, 1956
Buku Teks
Tietenberg, Thomas H., author
Pearson, 2009
Buku Teks
Tietenberg, Thomas H., author
Pearson, 2010
Buku Teks
American Enterprise Institute for Public Policy Research, 1973
Buku Teks
Tietenberg, Thomas H., author
Harper Collins, 1992
Buku Teks