Mathews, Craig F. (2004). Absolute Beginner's Guide to Tablet PCs. Indianapolis, Ind.: Que. pp. 12, 66. ISBN0-7686-6191-9. OCLC57706162.
Sholin, Marilyn (2009). The Art of Digital Photo Painting: Using Popular Software to Create Masterpieces (1st ed.). New York: Lark Books. pp. 11–12. ISBN978-1-60059-101-3. OCLC213301758.