====== Books and Encyclopedia ======
  
    * Aromatherapie in Wissenschaft und Praxis. Ed. Wolfgang Steflitsch. Stadelmann, 2013
    * BI-Lexikon Heilpflanzen und Drogen, Ennet D., Leipzig 1990 [BI]
    * British Herbal Pharmacopoeia [BHP83]
    * CRC Handbook of Medicinal Herbs 1985 [CRC]
    * Essential oil crops. Weiss, Edward A., Cab International, 1997
    * Food Plants of the World. Van Wyk, Ben-Erik Portland Oregon 2005 [FPW] 
    * Herbal Drugs and Phytopharmaceuticals 2009 [Wichtl] 
    * Meaningful Scents around the World, Roman Kaiser, Zürich 2006 [MSW]
    * Medicinal Plants of the World. Ben-Erik Van Wyk and Michael Wink, Pretoria 2004 [MPW]
    * Perfume and flavor materials of natural origin, Steffen Arctander, 1960 
    * Scent and Chemistry, Günther Ohloff, Wilhelm Pickenhagen, Philip Kraft, Wiley-VCH, 2012 [SAC]
    * Scent of the Vanishing Flora, Roman Kaiser, 2010 [SVF]
    * The scent of orchids: olfactory and chemical investigations., Kaiser, R., Basel 1993