I have an entire shelf of books dedicated to climbing and skiing instruction. And I still reference them from time to time. Before I crack open Freedom of the Hills or the AMGA Technical Manual, I'll try to find the answer in one of these first:
Ice and Mix Climbing: Modern Technique, by Will Gadd
Alpine Climbing: Techniques to Take You Higher, by Mark Houston and Kathy Cosley.
Climbing Self Rescue: Improvising Solutions for Serious Situations, by Andy Tyson and Molly Loomis.
Backcountry Skiing: Skills for Ski Touring and Ski Mountaineering, by Martin Volken, Scott Schell, and Margaret Wheeler.
Extreme Alpinism: Climbing Light, Fast, and High, and Kiss or Kill: Confessions of a Serial, by Mark Twight.
Self-Rescue, by David Fasulo.