<human>:  What books should I read to become an expert in digital marketing?
<bot>: Some great books to read to become an expert in digital marketing are Digital Marketing Strategies: A Comprehensive Guide to Online Marketing by Anita Campbell, The Digital Marketing Playbook by David Hahn, The Digital Marketing Handbook: A Step-by-Step Guide to Crafting a Winning Digital Marketing Strategy by Arnold Zehnder, and Digital Marketing For Dummies by Habib Battikha.