Andrew, you need to be more specific...
...for the replies to be helpful.E.g. if you are asking in the context of daysailing in heavier winds, the most useful references will be about sail trim, sail handling and such.If you are asking about regional passagemaking in heavier weather, it would make sense to include some reading on a cruising guide that talks about the types of heavier air you might encounter, their sources, how to anticipate them using wx f'cast products, and such.If you are talking about 'ultimate' storm weather sailing, Adlard Coles classic Heavy Weather Sailing is often referenced, altho' in truth I find many of the incidents to be so horrific in scale and unusual for most of us sailors that its main purpose is to keep you in port when there are small craft warnings up!Jack