Barros, Pedro (5 July 2011). "Cristiano é reforço por duas épocas" [Cristiano is an addition for two seasons]. A Bola (in Portuguese). Archived from the original on 8 July 2011. Retrieved 5 July 2011.
Toskitsis, Nikos (8 March 2010). "Σοκ με Κριστιάνο, 6 μήνες εκτός" [Cristiano shocker, 6 months out] (in Greek). Sport 24. Archived from the original on 11 March 2010. Retrieved 8 March 2010.
Toskitsis, Nikos (8 March 2010). "Σοκ με Κριστιάνο, 6 μήνες εκτός" [Cristiano shocker, 6 months out] (in Greek). Sport 24. Archived from the original on 11 March 2010. Retrieved 8 March 2010.
Barros, Pedro (5 July 2011). "Cristiano é reforço por duas épocas" [Cristiano is an addition for two seasons]. A Bola (in Portuguese). Archived from the original on 8 July 2011. Retrieved 5 July 2011.