YILMAZ, NAGIHAN, et al. “Chemical Composition and Antimicrobial Activities of the Essential Oils of Viburnum Opulus, Viburnum Lantana and Viburnum Orientala”. Asian Journal of Chemistry, vol. 20, no. 5, Mar. 2010, pp. 3324-30, https://asianpubs.org/index.php/ajchem/article/view/12762.