- dic.academic.ru dic.nsf/ruwiki/1127443
- players.fcbarcelona.com en/player/764-ronaldo-…
- flashscore.com player/ronaldo-cristiano/WGOY4FSt/
- teplowdom.ru ronaldo/morais/silva.html
- driftik.ru ronaldo-morais-silva
- biography.com athlete/ronaldo
- footballdatabase.eu en/player/details/424--ronaldo
- football.fandom.com wiki/Ronaldo