Pedrazzini, Alessio, Francesco Pogliacomi, Alessandra Colacicco, Cristina Galavotti, Massimo De Filippo, Silvio Tocco, and Francesco Ceccarelli. “Triphalangeal Thumb: Case Report and Literature Review”. Acta Bio Medica Atenei Parmensis 86, no. 3 (December 15, 2015): 290-295. Accessed August 8, 2020. https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/4986.