Ryan, D. (2012). Understanding Digital Marketing (2nd.). Kogan Page.
芝加哥风格引文Ryan, Damian. Understanding Digital Marketing. 2nd. Kogan Page, 2012.
MLA引文Ryan, Damian. Understanding Digital Marketing. 2nd. Kogan Page, 2012.
警告：这些引文格式不一定是100％准确.
APA引文