Here's another thing I do when I want to copy a picture that I have seen in one of my books...I remove the page with a razor blade. (I don't tell many people THAT because it is a "no no" for a lot of bibliophiles.)
It is nearly impossible to work with a book next to your easel...and yes, you've messed up the book, but the lesson you'll learn by copying can be well worth it!
I check out used bookstores looking for books with good prints in them....and alas, accurate reproduction in printing is very hard to come by...
This is a wonderful resource for bargain Art Books - Edward Hamiton (and the shipping is inexpensive):
http://www.edwardrhamilton.com/
Hamilton has a book listed right now "Van Dyck Drawings" with 370 illustrations (107 in color) for $54.95 (reg. price $95). It sounds like a pretty cheap bunch of "drawing lessons" to me....