Isabel Behrendt, Inga Schneider, Jan Philipp Schuchardt, Norman Bitterlich, and Andreas Hahn. “Effect of an Herbal Extract of Sideritis Scardica and B-Vitamins on Cognitive Performance under Stress: A Pilot Study”. International Journal of Phytomedicine 8, no. 1 (March 31, 2016): 95–103. Accessed December 5, 2024. https://ijp.arjournals.org/index.php/ijp/article/view/450.