Losada, M., A. Cano, J. Hernandez-Ruiz, and M. B. Arnao. “Phytomelatonin Content in Valeriana Officinalis L. And Some Related Phytotherapeutic Supplements”. International Journal of Plant Based Pharmaceuticals, vol. 2, no. 2, Mar. 2022, pp. 176-81, doi:10.55484/ijpbp.1079005.