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1. Worwood, Valerie Ann. The Fragrant Pharmacy. (Toronto: Bantam Books, 1990)
2. Davis, Patricia. Aromatherapy: An A-Z. (United Kingdom: Saffron Walden, 1988)
3. Tisserand, Robert and Tony Balacs. Essential Oil Safety. (Edinburgh: Churchill Livingstone, 1995)
4. Jeanne Rose, 375 Essential Oils And Hydrosols. (California: Frog Ltd, 1999)
5. Salvatore Battaglia, The Complete Guide to Aromatherapy. (Australia: The Perfect Potion, 1997)