↑David J. Anneken, Sabine Both, Ralf Christoph, Georg Fieg, Udo Steinberner, et Alfred Westfechtel, "Fatty Acids" in Ullmann's Encyclopedia of Industrial Chemistry (Weinhemiae: Wiley-VCH, 2006. doi:10.1002/14356007.a10_245.pub2.
↑Susan Miller Cavitch, The Natural Soap Book (Storey Publishing, 1994), ISBN 0-88266-888-9.