1. Valerianae radix—Valerian Root. 1997. ESCOP Monographs, European Scientific Cooperative on Phytotherapy.
2. Humulus lupulus [Hops], 1998. PDR for Herbal Medicines. Medical Economics Company, Inc., Montvale, NJ, pp. 900–901.
3. Biochemical and pharmacological characterization of [3H]GBR12935 binding in vitro to rat striatal membranes;Andersen;J. Neurochem,,1987
4. Valeriana species;Bos,1997
5. Estudio Farmacodinamico del Lupulo (Humulus lupulus L.) Accion Tranquilizante [Study of the Pharmacodynamics of the Tranquilizing Effect of Hops (Humulus lupulus L.);Bravo;Boll. Chim. Farm.,1974