Daughterty, T., & Hoffman, E. (2014). eWOM and the importance of capturing consumer attention within social media. Journal of Marketing Communications, 20(1/2), 82-102.
Nelson-Field, K. (2020). The attention economy and how media works: Simple truths for marketers. Palgrave Macmillan. Read Chapter 3, How Advertising Works (so far), and Chapter 4, The Evolution of Media Buying.