Barlowe, Raleigh
Prentice-Hall, 1958
Buku Teks
Dipasquale, Denise
Prentice-Hall, 1996
Buku Teks
Barlowe, Raleigh
Prentice-Hall, 1961
Buku Teks
Ely, Richard T.
University of Wisconsin Press, 1964
Buku Teks
Tietenberg, Thomas H.
Pearson, 2009
Buku Teks