Sebastiano Vernazza (10 March 2007). "Niccolai, artista dell'autogol" (in Italian). La Gazzetta dello Sport. Archived from the original on 16 April 2017. Retrieved 22 November 2015.
Sebastiano Vernazza (10 March 2007). "Niccolai, artista dell'autogol" (in Italian). La Gazzetta dello Sport. Archived from the original on 16 April 2017. Retrieved 22 November 2015.