Mellini, M., Merlino, S. and Orlandi, P. (1979): Versiliaite and apuanite, two new minerals from the Apuan Alps, Italy. American Mineralogist 64, 1230-1234.
Mellini, M. and Merlino, S. (1979): Versiliaite and apuanite: derivative structures related to schafarzikite. American Mineralogist 64, 1235-1242.
Mellini, M., Amouric, M., Baronnet, A. and Mercuriot, G. (1981): Microstructures and nonstoichiometry in schafarzikite-like minerals. American Mineralogist 66, 1073-1079.
Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 19.