Giulio Corradino Corradini (7 June 1908). "Federazione acefala" (in Italian). La Stampa Sportiva. pp. 10–11. Archived from the original on 29 August 2018. Retrieved 24 August 2018.
Annuario 1931, p. 40.Archived 15 July 2014 at the Wayback Machine "Il campionato di Divisione Nazionale è diviso in due serie: A e B" (The Championship of Divisione Nazionale is divided into two Serie: A and B").
Giulio Corradino Corradini (6 September 1908). "Vexata quaestio" (in Italian). La Stampa Sportiva. p. 4. Archived from the original on 23 September 2015. Retrieved 24 August 2018.
Giulio Corradino Corradini (7 June 1908). "Federazione acefala" (in Italian). La Stampa Sportiva. pp. 10–11. Archived from the original on 29 August 2018. Retrieved 24 August 2018.
Giulio Corradino Corradini (6 September 1908). "Vexata quaestio" (in Italian). La Stampa Sportiva. p. 4. Archived from the original on 23 September 2015. Retrieved 24 August 2018.
Annuario 1931, p. 40.Archived 15 July 2014 at the Wayback Machine "Il campionato di Divisione Nazionale è diviso in due serie: A e B" (The Championship of Divisione Nazionale is divided into two Serie: A and B").