i`m the author of darstellungstechnik, german rendering book. this title you can actually get only in german and japanese
language, but i have good news for you. My new title darstellungsmedien is also available in english, the english title
is representation media, its about rendering, especially about the different sketching media. it`s 29,90 Euro, you can order
it on my adress, or on www.elbtunnel.de
, or amazon (klick on the title,and you get pictures).
http://www.amazon.de/Representationmedi ... 707&sr=8-2
http://www.amazon.de/Darstellungstechni ... 756&sr=8-1
if you have any questions about my books, please send me an e-mail.