For ease of reference here are our books on pruning:
The Pruning Book is very complete and covers pruning nearly everything, with lots of special notes for particular plants, but is pretty "straight" in that it does not employ organic, biodynamic, or holistic approaches to pruning.
How To Prune Fruit Trees is a small book with line drawings that is so dear to a generation of fruit growers that Walter Anderson nurseries reprinted it themselves when it went out of print.
The Holistic Orchard just covers tree fruits and berries but is very readable, very thorough, with lots of pictures and illustrations. We see it as equivalent to The Pruning Book, but more limited in scope (does not cover pruning anything else - bonsai, for example). This book is completely organic with a holistic approach. For example, Michael believes in what many would call "comprehensive preventative maintenance" for overall and lifetime health.
The Biodynamic Orchard Book If you are a biodynamic gardener this is your book. The authors are two brilliant practitioners of the biodynamic movement. Totally holistic and way beyond organic.