Here are some links to works that have been formative to my philosophy and approach to permaculture.
Books
A Pattern Language – Alexander et al
A fathomless resource for redesigning the world according to patterns that are proven to work.
The One Straw Revolution – Masanobu Fukuoka
Practical and spiritual guide to natural farming
Small is Beautiful , and Good Work – E. F. Schumacher
From one of the few economists who understands economics. Eternal concepts about good work, resource limits and the economics of happiness.
Zen and the Art of motorcycle maintenance – Robert Pirsig
Original philosophical journey on quality in work & life.
Practical Solar Heating – McCartney & Ford
Concise guide to DIY solar heating from the 70s oil crisis.
The Earth Care Manual – Patrick Whitfield
Textbook for permaculture in temperate climates.
Organic Gardening – Charles Dowding
Clear instructions for no-dig gardening.
The Complete Guide to Self Sufficiency – John Seymour
Classic moral and practical guide to many aspects of sustainable farming and living