Vicario, Ernesto (22 December 1997). "Freno a la escalada del Betis" [Betis climb stopped in its tracks]. Mundo Deportivo (in Spanish). Retrieved 28 April 2020.
Vasconcelos, Gonçalo (11 August 2000). "Porfírio reforça Marítimo" [Porfírio strengthens Marítimo]. Record (in Portuguese). Archived from the original on 16 July 2015. Retrieved 13 April 2015.
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record.xl.pt
Vasconcelos, Gonçalo (11 August 2000). "Porfírio reforça Marítimo" [Porfírio strengthens Marítimo]. Record (in Portuguese). Archived from the original on 16 July 2015. Retrieved 13 April 2015.