"Comunicado" [Announcement] (PDF) (in Portuguese). FC Porto. 3 August 2010. Archived from the original(PDF) on 24 December 2011. Retrieved 28 April 2011.
Sampaio, Ana Catarina (10 May 2009). "FC Porto é tetra-campeão" [FC Porto are back-to-back-to-back-to-back champions] (in Portuguese). Jornalismo Porto Net. Retrieved 22 June 2017.
"Comunicado" [Announcement] (PDF) (in Portuguese). FC Porto. 3 August 2010. Archived from the original(PDF) on 24 December 2011. Retrieved 28 April 2011.