l91.
Key texts on permaculture include: Bill Mollison and David Holmgren (1978), Permaculture One: A Perennial Agriculture for Human Settlements; Bill Mollison (1988), Permaculture: A Designers’ Manual; David Holmgren (2002), Permaculture: Principles and Pathways Beyond Sustainability; Patrick Whitefield (1996), How to Make a Forest Garden; Patrick Whitefield (2004), The Earth Care Manual.