There are currently three excellent books around on sausages
This is one of them, (from 1994) covering a huge range of the product, the history, recipes, a types.
The other two are Jane Grigson's classic "Charcuterie and French Pork Cookery" - (from 2001) which I like for its comprehensiveness, and Michael Ruhlan and Brian Polcyn's "Charcuterie" (from 2005) which is a slightly larger format, and is from America
If you add Fergus Henderson's remarkable "Nose to Tail Eating" (from 2004) you have everything you need to guide you in preparing and eating pork... and enjoying yourself...