Weaving detailed information with examples and personal experiences, Gaia's Garden is one of the best-selling permaculture books for a reason. Toby Hemenway breaks down the principles of permaculture and keys to sustainable design in an interesting format that can be applied whether you've got rural acreage, a small city lot, or just an apartment balcony.
The ideas presented challenge resource-intensive home gardening and even native-only landscapes in favor of productive spaces that leverage small tweaks to achieve a significant impact. Through topics like gray water usage, optimizing edge, turning domestic animals into "mini farmers", and maintaining the underground circle of life, Toby discusses the "why" with the "how", and leaves you motivated to make it happen.
note: This is the book that started the permaculture journey behind Cotoverde (read on a Kindle by headlamp, behind a mosquito net, in a remote village of Ecuador). It's packed with charts and visuals for reference that don't translate well to the e-reader version so its probably best to go with a hard copy.