Books that I can confidently state should be owned (because I own them):

Space Resources and Space Settlements

Space Settlements: A Design Study

The High Frontier: Human Colonies In Space

The Starflight Handbook: A Pioneer’s Guide to Interstellar Travel

Colonies in Space: A Comprehensive and Factual Account of the Prospects for Human Colonization of Space

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Books that look promising, but that I don’t have firsthand experience with:

Mining the Sky: Untold Riches From The Asteroids, Comets, And Planets

Space 2.0: How Private Spaceflight, a Resurgent NASA, and International Partners are Creating a New Space Age

Space Settlements 

MARS COLONIES: Plans for Settling the Red Planet

And then… there’s this:

Designing and Building Space Colonies: A Blueprint for the Future

Looks good. But then comes the authors bio: “Martin’s interest in the Paranormal, Spirituality, and much more goes back to his childhood. He has had many paranormal experiences and has been a student of Eastern Philosophies and Meditation for 35 years. Seeking Enlightenment; he knows that we are already all Enlightened. We just have to realize this deeply. His books are expressions of his creativity to help others understand what he has internalized through study, experience, and membership in different societies.” Ummmm……