key book: Structural Packaging Designs
Forms, Folds and Sizes: All the Details Graphic Designers Can Never Find but Need to Know Chapter 9: Packaging Styles (PDF)
http://designerstoolbox.com/designresources/
http://www.nicepapertoys.com/profiles/blogs/1905839:BlogPost:6188
http://www.tamasoft.co.jp/pepakura-en/