Flavin, Christopher
Worldwatch Institute , 1986
Buku Teks
Flavin, Christopher
Worldwatch Institute, 1985
Buku Teks
Nugent, Nicholas
In Print Publishing, 1996
Buku Teks
Faith, Nicholas
Motorbooks International, 1995
Buku Teks
Lansdell, Norman
Penguin Books, 1958
Buku Teks