McDaniel, Robert (1997). The Elegant Art of Handmade Soap: Making, Scenting, Coloring, and Shaping. Iola, WI: Krause Publications. ISBN 0-87341-832-8. 0-87341-832-8
Miller Cavitch, Susan (1997). The Soap Maker's Companion: A Comprehensive Guide with Recipes, Techniques, and Know-How. North Adams, MA: Storey Books. ISBN 0-88266-965-6. 0-88266-965-6
The Merriam-Webster Dictionary. Springfield, MA: Merriam-Webster, Inc. 1994. ISBN 0-87779-911-3. 0-87779-911-3