"Alberto Grassi fino al 2020" [Alberto Grassi until 2020] (in Italian). Atalanta's official website. 2 October 2015. Archived from the original on 4 March 2016. Retrieved 29 November 2015.
"Alberto Grassi all'Atalanta" [Alberto Grassi is Atalanta] (in Italian). Atalanta's official website. 30 August 2016. Archived from the original on 14 August 2018. Retrieved 30 August 2016.
Agorà Telematica - Agorà Med - S.r.l. "Prima Squadra - SSC Napoli". www.sscnapoli.it. Archived from the original on 29 February 2016. Retrieved 2 February 2016.
Agorà Telematica - Agorà Med - S.r.l. "Prima Squadra - SSC Napoli". www.sscnapoli.it. Archived from the original on 29 February 2016. Retrieved 2 February 2016.
"Alberto Grassi fino al 2020" [Alberto Grassi until 2020] (in Italian). Atalanta's official website. 2 October 2015. Archived from the original on 4 March 2016. Retrieved 29 November 2015.
"Alberto Grassi all'Atalanta" [Alberto Grassi is Atalanta] (in Italian). Atalanta's official website. 30 August 2016. Archived from the original on 14 August 2018. Retrieved 30 August 2016.