English:

-Dr. Brian Lawrence, Essential oils 5 tomes (1976-1994)
Published by Allured Publishing Corporation
214 West Willow, P.O. Box 318, Wheaton, Illinois 60187, USA
Telephone 312/653-2155, Fax 312/653-2192

-“The essential oils” Guenther, volume 1 à 6.
Robert Krieger Publishing Company, INC
Krieger Drive
Malabar, Florida 32950
USA

-Perfume and Flavore Materials of Natural Origin
Steffen Arctander
Allured Publishing Corporation

-The Aromatherapy Practitioner Reference Manual, Sheppard‑Hanger, Sylla
Available from the Atlantic Institute of Aromatherapy, 16018 Saddlestring Dr.,Tampa, FL 33618 USA

-Complete Book of Essential Oils & Aromatherapy by Valerie Worwood
(this is the US version of Fragrant Pharmacy) – over 600 recipes)

-Aromatherapy for Health Professionals by Shirley Price

Essential Oil Safety: A Guide for Health Care Professionals‑ Robert Tisserand and Tony Balacs

-Plant Aromatics ‑ A Data & Reference Manual by Martin Watt

-The Aromatherapy Workbook by Shirley Price

-Aromatherapy
Vivian Lunnt MD
1997
ISBN 0-86101 906 7

-“Aromatherapy for Healing the Spirit”
Gabriel Mojay
Gaia Books Limited
ISBN 0-8050-4496-

-“The Energetics of Western Herbs”
An Herbal Reference Integrating Western and Oriental Herbal Medecine Traditions  Peter Holmes
Volume 1 en 2
Snow Lotus Press Boulder
ISBN 0-9623477-4-4