The Freelance Way by Robert Vlach
Company of One by Paul Jarvis
The E-Myth Revisited by Michael E. Gerber
Built to Sell by John Warrillow
Million Dollar Consulting by Alan Weiss
Deep Work by Cal Newport
The Psychology of Money by Morgan Housel
Book Yourself Solid by Michael Port
Essentialism: The Disciplined Pursuit of Less by Greg McKeown
Influence: The Psychology of Persuasion by Robert Cialdini
Profit First by Mike Michalowicz