APA (7th ed.) Citation
Hammel, M. J. (2012). The artist's guide to GIMP: Creative techniques for photographers, artists, and designers (2nd ed.). No Starch Press.
Chicago Style (17th ed.) Citation
Hammel, Michael J. The Artist's Guide to GIMP: Creative Techniques for Photographers, Artists, and Designers. 2nd ed. San Francisco: No Starch Press, 2012.
MLA (9th ed.) Citation
Hammel, Michael J. The Artist's Guide to GIMP: Creative Techniques for Photographers, Artists, and Designers. 2nd ed. No Starch Press, 2012.
Warning: These citations may not always be 100% accurate.