"Gosta Pettersson Gano El "Giro"" [Gosta Pettersson wins the "Tour"] (PDF). El Mundo Deportivo (in Spanish). 11 June 1971. p. 17. Archived(PDF) from the original on 26 January 2019. Retrieved 27 May 2012.
"Gosta Pettersson Gano El "Giro"" [Gosta Pettersson wins the "Tour"] (PDF). El Mundo Deportivo (in Spanish). 11 June 1971. p. 17. Archived(PDF) from the original on 26 January 2019. Retrieved 27 May 2012.