APA (7th ed.) Citation

Clarke, A. (2015). SEO 2015: Learn search engine optimization with smart internet marketing strategies. Digital Book Guru.

Chicago Style (17th ed.) Citation

Clarke, Adam. SEO 2015: Learn Search Engine Optimization with Smart Internet Marketing Strategies. [United States?]: Digital Book Guru, 2015.

MLA (9th ed.) Citation

Clarke, Adam. SEO 2015: Learn Search Engine Optimization with Smart Internet Marketing Strategies. Digital Book Guru, 2015.