APA (7th ed.) Citation

Peachpit Press & Barker, C. (2015). Mastering the Pen Tool (1st edition.). Peachpit Press.

Chicago Style (17th ed.) Citation

Peachpit Press and Corey Barker. Mastering the Pen Tool. 1st edition. Peachpit Press, 2015.

MLA (9th ed.) Citation

Peachpit Press and Corey Barker. Mastering the Pen Tool. 1st edition. Peachpit Press, 2015.

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