Dursun, Atilla, and Melek Ekinci. “Chemical Contents of Fennel (Foeniculum Vulgare Var. Dulce) Grown North East Anatolian Region”. Asian Journal of Chemistry, vol. 21, no. 1, Mar. 2010, pp. 644-8, https://asianpubs.org/index.php/ajchem/article/view/18968.