John Jeavons was an important introduction to developing garden soil fertility. His book, How to Grow More Vegetables ... was an important introduction to more intensive efforts. Peter Chan's Better Vegetable Gardens the Chinese Way simplified it. Reading about Rudolf Steiner showed how I could have gone another way. It seemed far less than practical.
I was once involved as a community gardener. A friend "took over" the garden on one side. He was very much a disciple of the organic, which probably worked okay for him as a baker but his ideas on gardening proved so impractical. He dug out one bed, amended, and planted it. Started another and couldn't finish by midseason. More than 3/4 of his allotment remained untouched. The next year, he didn't make it back and the ground remained fallow. I visited him at home and his backyard was the same story -- wildly cultivated and left untended over years, apparently.
Niki Jabbour has some good guidance for gardeners living in the northern climates. Eliot Coleman took protected growing in a more commercial direction but, even for folks with small gardens, also practical.
Steve