Hendler S, Rorvik D, Fleming T et al. (2001) PDR for Nutritional Supplements, 1st ed. Medical Economics / Thomson Healthcare. pp 277-279.

Juneja LR, Chu DC, Okubo T, Nagato Y, and Yokogoshi H. (1999) L-theanine - a unique amino acid of green tea and its relaxation effect in humans. Trends in Food Science and Technology. 10(6-7):199-204.

Supplement Watch information on L-Theanine