Janstsch, J., & Singleton, P. (2016). SEO for Growth: The ultimate guide for marketers, web designers & entrepreneur. Duct tape publishing.
Citazione stile Chigago Style (17a edizione)Janstsch, John, e Phil Singleton. SEO for Growth: The Ultimate Guide for Marketers, Web Designers & Entrepreneur. New York: Duct tape publishing, 2016.
Citatione MLA (9a ed.)Janstsch, John, e Phil Singleton. SEO for Growth: The Ultimate Guide for Marketers, Web Designers & Entrepreneur. Duct tape publishing, 2016.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.