"Abel no Benfica" [Abel signs with Benfica]. Diário de Lisboa (in Portuguese) (22667): 19. 18 May 1988. Archived from the original on 21 June 2018. Retrieved 21 June 2018.
"Aumentam as trocas" [Trades increase]. Diário de Lisboa (in Portuguese) (23257): 25. 7 June 1990. Archived from the original on 21 June 2018. Retrieved 6 August 2016.
"Abel no Benfica" [Abel signs with Benfica]. Diário de Lisboa (in Portuguese) (22667): 19. 18 May 1988. Archived from the original on 21 June 2018. Retrieved 21 June 2018.
"Aumentam as trocas" [Trades increase]. Diário de Lisboa (in Portuguese) (23257): 25. 7 June 1990. Archived from the original on 21 June 2018. Retrieved 6 August 2016.