APA (7th ed.) Citation

Anon, E., & Anon, J. (2009). Photoshop CS4 for nature photographers: A workshop in a book. Wiley Publishing.

Chicago Style (17th ed.) Citation

Anon, Ellen, and Josh Anon. Photoshop CS4 for Nature Photographers: A Workshop in a Book. Indianapolis: Wiley Publishing, 2009.

MLA (9th ed.) Citation

Anon, Ellen, and Josh Anon. Photoshop CS4 for Nature Photographers: A Workshop in a Book. Wiley Publishing, 2009.