APA (7th ed.) Citation

Kelbytraining, Peachpit Press, Barker, C., & Barker, C. (2008). Photoshop CS4 for designers (1st edition.). Kelbytraining : Peachpit Press.

Chicago Style (17th ed.) Citation

Kelbytraining, Peachpit Press, Corey Barker, and Corey Barker. Photoshop CS4 for Designers. 1st edition. [Berkeley, Calif.?]: Kelbytraining : Peachpit Press, 2008.

MLA (9th ed.) Citation

Kelbytraining, et al. Photoshop CS4 for Designers. 1st edition. Kelbytraining : Peachpit Press, 2008.