book suggestions for sketching needed!

Hi, I posted this on “students n schools” but I might just get a better reaction from those out of school:


Does anyone have suggestions on books to read to help with (beginner) product sketching? I read through this thread: http://boards.core77.com/viewtopic.php?t=1795&start=0&postdays=0&postorder=asc&highlight=read+book

All of the links to online sources were really great, but any other suggestions would be much appreciated!