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Here are some popular titles that could be helpful:

1. "The 4-Hour Workweek" by Timothy Ferriss - Focuses on lifestyle design and leveraging online tools for income generation.

2. "The Millionaire Fastlane" by MJ DeMarco - Discusses strategies to accelerate wealth creation through online businesses.

3. "DotCom Secrets" by Russell Brunson - Covers techniques and strategies for online marketing and sales funnels.

4. "The Lean Startup" by Eric Ries - Though not directly about earning online, it offers valuable insights into creating and scaling startups, many of which are online.

5. "Rich Dad Poor Dad" by Robert Kiyosaki - Explores mindset and financial strategies that can be applied to online ventures.

6. "The $100 Startup" by Chris Guillebeau - Profiles entrepreneurs who built small businesses earning $50,000 or more from modest investments, often online.

7. "Crush It!: Why NOW Is the Time to Cash In on Your Passion" by Gary Vaynerchuk - Discusses using the internet and social media to turn passions into profits.

8. "Make Money Online: Roadmap of a Dot Com Mogul" by John Chow - Shares insights and strategies from the author's journey to becoming a successful online entrepreneur.

9. "The Ultimate Blueprint for an Insanely Successful Business" by Keith J. Cunningham - Offers practical advice on building and scaling businesses, relevant for online ventures.

10. "How to Make Money in Stocks" by William J. O'Neil - While focused on stock trading, it provides insights into financial management and growth strategies applicable to online income.

Please note that while these books provide valuable insights, success in online earning often requires practical application, persistence, and adaptation to evolving technologies and markets.