APA (7e ed.) Bronvermelding

229252 Clay, B., Esparza, S., & Sullivan, D. (2009). Search engine optimization all-in-one desk reference for dummies. Hoboken, NJ : Wiley Publishing.

Chicago (17e ed.) Bronvermelding

229252 Clay, Bruce, Susan Esparza, en Danny Sullivan. Search Engine Optimization All-in-one Desk Reference for Dummies. Hoboken, NJ : Wiley Publishing, 2009.

MLA (9e ed.) Bronvermelding

229252 Clay, Bruce, et al. Search Engine Optimization All-in-one Desk Reference for Dummies. Hoboken, NJ : Wiley Publishing, 2009.