Ryan, D. (2021). Understanding digital marketing: A complete guide to engaging customers and implementing successful digital campaigns (Fifth edition.).
芝加哥风格引文Ryan, Damian. Understanding Digital Marketing: A Complete Guide to Engaging Customers and Implementing Successful Digital Campaigns. Fifth edition. :, 2021.
MLA引文Ryan, Damian. Understanding Digital Marketing: A Complete Guide to Engaging Customers and Implementing Successful Digital Campaigns. Fifth edition. 2021.
警告：这些引文格式不一定是100％准确.