"Claudio" (in Portuguese). Mais Futebol. Archived from the original on 24 October 2021. Retrieved 22 October 2021.
Maia, Vítor; Cunha, Pedro Jorge (20 May 2016). "Vizela: o regresso à II Liga oito anos depois" [Vizela: returning to the II League eight years later] (in Portuguese). Mais Futebol. Archived from the original on 21 October 2021. Retrieved 22 October 2021.
"Gil Vicente: Cláudio anuncia saída" [Gil Vicente: Cláudio announces exit] (in Portuguese). Mais Futebol. 4 June 2013. Archived from the original on 22 October 2021. Retrieved 22 October 2021.
"Claudio" (in Portuguese). Mais Futebol. Archived from the original on 24 October 2021. Retrieved 22 October 2021.
Maia, Vítor; Cunha, Pedro Jorge (20 May 2016). "Vizela: o regresso à II Liga oito anos depois" [Vizela: returning to the II League eight years later] (in Portuguese). Mais Futebol. Archived from the original on 21 October 2021. Retrieved 22 October 2021.
"Cláudio: "Raça e muita luta"" [Cláudio: "Heart and a lot of fighting"]. Record (in Portuguese). 19 March 2012. Archived from the original on 24 September 2015. Retrieved 16 August 2015.
"Gil Vicente: Cláudio anuncia saída" [Gil Vicente: Cláudio announces exit] (in Portuguese). Mais Futebol. 4 June 2013. Archived from the original on 22 October 2021. Retrieved 22 October 2021.
"Cláudio: "Raça e muita luta"" [Cláudio: "Heart and a lot of fighting"]. Record (in Portuguese). 19 March 2012. Archived from the original on 24 September 2015. Retrieved 16 August 2015.