There are different text sources from which you can learn how to lead your co-founders and team members.
1. Popular business articles and books
Most people buy popular business books that are Amazon, New York Times, or Wall Street Journal bestsellers.
For example, John C. Maxwell’s 21 Irrefutable Laws of Leadership is a popular business books.
They are based on the year-long experiences of the authors and often provide practical insights.
2. Advanced text books
If you want to go to the next level, then find a text book in your market niche.
Text books such as Peter Northouse’s Leadership: Theory and Practice provide qualitative and quantitative research insights.
They are based on analysed data from hundreds or thousands of people.
This makes the won insights more generalisable and insightful than popular business books that are just based on the experience from the author.
The downside is that they are also a lot more expensive and theoretical.
3. Academic journal articles
If you want to learn how current developments and shifts change the academic field of leadership, then take a deep dive into articles of academic journals.
For example, you can read Academy of Management Journal, Journal of Applied Psychology, Journal of Business Venturing, Leadership and Organisation Development Journal, or Leadership Quarterly.
The published articles are peer-reviewed and one page is equally insightful as a summary of a whole popular business book.
When I wrote my dissertation on entrepreneurial leadership, I was supervised by a professor who regularly publishes in such journals.
I learned more from her published academic articles than from all my read popular leadership books combined.
The downside is that they are hard to read and very expensive if you do not possess an institutional login to access them.
Learn from all three sources and do not forget that leadership is not only about theory but also about practise.