Jon, Sang-in, author
Ecoribureu, 2007
Buku Teks
Emmot, Bill, author
Allen Lane, 2003
Buku Teks
Maynard, Herman Bryant
Berrett-Koehler , 1993
Buku Teks
Kennedy, Paul M
Vintage Books, 1993
Buku Teks
Dreyfus, Franois-Georges
Edtions de Fallois , 1996
Buku Teks