{{Cite journal| doi = 10.7241/ourd.20193.1| issn = 20819390| volume = 10| issue = 3| pages = 229–233| last1 = Tamer| first1 = Funda| last2 = Avci| first2 = Emine| title = Decreased serum ferritin and vitamin D levels in patients with recurrent aphthous stomatiti| journal = Our Dermatology Online| accessdate = 2019-07-01| date = 2019-07-02| url = http://www.odermatol.com/issue-in-html/2019-3-1-aphthous/}}