Owen, Diane S., author
Harcourt, Brace Jovanovich , 1991
Buku Teks
Brandis, Royall, author
Richard D. Irwin, 1959
Buku Klasik
Macgregor, D.H., author
Oxford University Press, 1949
Buku Teks
Culyer, A.J.
Martin Robertson , 1975
Buku Teks
Tietenberg, Thomas H., author
Pearson, 2010
Buku Teks