T.L. Shear, Hesperia, 2, 1933, pp. 453, 519-527. D.B. Thompson, Hesperia, 13, 1944, pp. 173-209. H.A. Thompson, Harvard Studies in Classical Philology, Supplement I, 1940, pp. 183ff. M. Besnier, in Daremberg ... Agora 14 191 ... H.A. Thompson, Harvard Studies in Classical Philology, Supplement I, 1940, pp. 183ff ... M. Besnier, in Daremberg et Saglio, Dictionnaire, s.v., Purpura, fig. 5887