[Scribus] Good Book for Newby Designer?

[Tony Cowderoy]

I've used Scribus 1.3 to produce my company's brochure this year.  I'm 
an occasional user of DTP and not a professional designer.  Using 
Scribus has made me begin to realise just how little I know about visual 
design.

Can anyone recommend a good book on design, in English, suitable for a 
beginner who knows quite a lot about software but not much about 
professional design?  I don't want a "how to design with package X" 
book.  I want one that is about design, not software and I'm looking for 
something that starts with basic principles but also goes into quite a 
lot of depth.  Any suggestions?

Tony Cowderoy