APA (7th ed.) Citation

Kelby, S. (2011). Professional portrait retouching techniques for photographers using Photoshop. New Riders.

Chicago Style (17th ed.) Citation

Kelby, Scott. Professional Portrait Retouching Techniques for Photographers Using Photoshop. [Berkeley, Calif.]: New Riders, 2011.

MLA (8th ed.) Citation

Kelby, Scott. Professional Portrait Retouching Techniques for Photographers Using Photoshop. New Riders, 2011.

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