Vanzolini, P.E. 1968. Environmental temperature and number of body annuli in Amphisbaena alba: notes on a cline (Sauria, Amphisbaenidae). Papéis Avulsos de Zoologia. 21, 1-28 (1967-1968) (Apr. 1968), 231–241. DOI:https://doi.org/10.11606/0031-1049.1968.21.p231-241.