Lane, G. “The Effects of GABA, L-Theanine, Passiflora Incarnata and Prunus Cerasus in Reducing the Symptoms of Nervousness in Individuals With Anxiety and/Or Depression”. Journal of Nutritional Therapeutics, vol. 3, no. 4, Dec. 2014, pp. 175-7, doi:10.6000/1929-5634.2014.03.04.5.