Richarz, Clemens
Birkhal'user, 2007
Buku Teks
Thiede, Sebastian, editor
[Springer, ], 2012
eBooks
Flavin, Christopher, author
Worldwatch Institute, 1988
Buku Teks
Anderson, Victor
Routledge, 1993
Buku Teks
Scharchmidt, Clemens
Berlin Jumker und Dunnhauft 1942
Buku Teks