Along with the books mentioned, there is a new book called, "The Complete Idoit's Guide to Making Natural Soaps" by Sally Trew with Zonella Gould that I like. It covers CP, HP, Melt & Pour, Goat Milk soap, colorants, EOs & FOs, and a chapter on how to use Soapcalc.net. It includes several basic soap formulas (with Palm oil as the main oil). But the primary source of soapmaking information is found on these forums where soapmakers share their experiences. And making soap yourself is a great way to learn.