http://ebooks.computerworks.eu/vectorworks/modus/01
http://ebooks.computerworks.eu/vectorworks/modus/02
http://ebooks.computerworks.eu/vectorworks/modus/03
http://ebooks.computerworks.eu/vectorworks/modus/04
http://ebooks.computerworks.eu/vectorworks/modus/05
http://ebooks.computerworks.eu/vectorworks/modus/06
http://ebooks.computerworks.eu/vectorworks/modus/07