The Handmade Soap Book
One of the best know-hows on soaps (at least in English)
I've bought and read loads about soapmaking, both on books and on the internet, but this one seems so far the most accurate, comprehensive and logical approach to the activity I've found so far. With a clear explanation on how to use different fats
fats and different methods, it contains amazing recipes as well as first hand examples and troubleshooting tips. I could never have done without it!