Lavender and the nervous system by Peir Hossein Koulivand, Maryam Khaleghi Ghadiri, and Ali Gorji (2013). Evidence-Based Complementary Alternative Medicine, https://doi.org/10.1155/2013/681304
Herbs at a Glance: A Quick Guide to Herbal Supplements by the National Center for Complementary and Alternative Medicine (2009)