APA (7th ed.) Citation

Harrington, R. A. (2009). Understanding Adobe Photoshop CS4: The essential techniques for imaging professionals (2nd edition.). Peachpit Press.

Chicago Style (17th ed.) Citation

Harrington, Richard Author. Understanding Adobe Photoshop CS4: The Essential Techniques for Imaging Professionals. 2nd edition. [Place of publication not identified]: Peachpit Press, 2009.

MLA (9th ed.) Citation

Harrington, Richard Author. Understanding Adobe Photoshop CS4: The Essential Techniques for Imaging Professionals. 2nd edition. Peachpit Press, 2009.

Warning: These citations may not always be 100% accurate.