Read about permaculture without staring at a screen, perhaps even while enjoying bucolic surroundings:
Introduction to Permaculture by Bill Mollison
Permaculture Designer's Manual by Bill Mollison
Principles and Pathways Beyond Sustainability by David Holmgren
Gaia's Garden by Toby Hemenway
Field Glossary by Reed Aubin (gratuitous plug! this book is a minor resource compared with these seminal works, but is indeed a fine and specialized product.)