1. Poucher, W.A., “Perfumes, Cosmetics and Soaps,” Seventh Edition, Vol. 2, Chapman and Hall Ltd., London, 1959, p. 3.
2. McDonough, E.G., “Truth About Cosmetics,” The Drug and Cosmetic Industry, New York, 1937, p. 12.
3. Sarton, G., “Introduction to the History of Science,” Vol. I, Williams and Wilkins, Baltimore, 1927.
4. National Formulary, 13th Edition, American Pharmaceutical Association, Mack, Easton, Pa., 1971.
5. Wall, F.E., “Origin and Development of Cosmetic Science and Technology,” in “Cosmetics Science and Technology,” Edited by E. Sagarin, Interscience, New York, 1957, p. 30.