Jefferson Oliveira (English Wikipedia)

"Jefferson ceduto alla Salernitana" [Jefferson sold to Salernitana]. Udinese Calcio (in Italian). www.udinese.it. 11 January 2011. Archived from the original on 16 July 2012.
"Ceduti Forestieri e Fabio Ayres" [Sold Forestieri & Fabio Ayres]. Udinese Calcio (in Italian). www.udinese.it. 13 January 2011. Archived from the original on 13 September 2012. Retrieved 25 January 2011.

facebook.com

"We are pleased to announce that 30-year-old Brazilian center-back Jefferson Oliveira has signed a contract with Noah". facebook.com/noah.footballclub/. FC Noah Facebook. 3 February 2021. Retrieved 3 February 2021.
"The contract of our player Jefferson Formigão has expired, and has not been extended". facebook.com/noah.footballclub/. FC Noah Facebook. 16 December 2021. Retrieved 17 December 2021.

fbcunionevenezia.com

"UFFICIALE: Jefferson Alves Oliveira è arancioneroverde" (in Italian). Football Club Unione Venezia. 24 January 2013. Archived from the original on 24 July 2014. Retrieved 17 July 2014.

registroimprese.it

Vicenza Calcio S.p.A. bilancio (financial report and accounts) on 30 June 2014 (in Italian), PDF purchased from Italian C.C.I.A.A. Archived 2014-04-30 at the Wayback Machine

salernitana.it

press.salernitana.it

"Preso in prestito dall'Udinese il centrale difensivo brasiliano Jefferson" [Taken on loan from Udinese the Brazilian centre-back Jefferson]. Salernitana Calcio 1919 (in Italian). 11 January 2011. Archived from the original on 22 July 2011. Retrieved 24 February 2011.
"Prelevato in prestito dall'Udinese l'attaccante Fabio Ayres" [Taken on loan from Udinese striker Fabio Ayres]. Salernitana Calcio 1919 (in Italian). 13 January 2011. Archived from the original on 22 July 2011. Retrieved 25 January 2011.

tuttolegapro.com

"UFFICIALE: un nuovo volto in difesa per il Bellaria". Tutto Lega Pro (in Italian). Tutto Mercato Web. 31 August 2013. Archived from the original on 26 July 2014. Retrieved 17 July 2014.

udinese.it

"Youth Teams: Milan-Udinese 3-2". Udinese Calcio. www.udinese.it. 28 November 2010. Archived from the original on July 22, 2011. Retrieved 24 February 2011.
"Jefferson ceduto alla Salernitana" [Jefferson sold to Salernitana]. Udinese Calcio (in Italian). www.udinese.it. 11 January 2011. Archived from the original on 16 July 2012.
"Ceduti Forestieri e Fabio Ayres" [Sold Forestieri & Fabio Ayres]. Udinese Calcio (in Italian). www.udinese.it. 13 January 2011. Archived from the original on 13 September 2012. Retrieved 25 January 2011.

vicenzacalcio.com

"Calciomercato: tutte le operazioni delle scorse settimane" (in Italian). Vicenza Calcio. 2 September 2013. Archived from the original on 28 July 2014. Retrieved 17 July 2014.
"Chiusura compartecipazioni: tutte le operazioni" (in Italian). Vicenza Calcio. 20 June 2014. Archived from the original on 2014-07-04. Retrieved 17 July 2014.
"Numerazione maglie calciatori" (in Italian). Vicenza Calcio. 5 September 2014. Archived from the original on 2016-02-01. Retrieved 24 August 2015.
"Alle 12.00 conclusa la proroga del mercato: tutte le operazioni" (in Italian). Vicenza Calcio. 15 September 2014. Archived from the original on 2015-01-29. Retrieved 24 August 2015.

web.archive.org

"Youth Teams: Milan-Udinese 3-2". Udinese Calcio. www.udinese.it. 28 November 2010. Archived from the original on July 22, 2011. Retrieved 24 February 2011.
"Preso in prestito dall'Udinese il centrale difensivo brasiliano Jefferson" [Taken on loan from Udinese the Brazilian centre-back Jefferson]. Salernitana Calcio 1919 (in Italian). 11 January 2011. Archived from the original on 22 July 2011. Retrieved 24 February 2011.
"Prelevato in prestito dall'Udinese l'attaccante Fabio Ayres" [Taken on loan from Udinese striker Fabio Ayres]. Salernitana Calcio 1919 (in Italian). 13 January 2011. Archived from the original on 22 July 2011. Retrieved 25 January 2011.
"Perugia calcio, il Grifo alla prima partitella a ranghi contrapposti" (in Italian). AC Perugia Calcio. 15 July 2012. Archived from the original on 7 July 2014. Retrieved 17 July 2014.
"UFFICIALE: Jefferson Alves Oliveira è arancioneroverde" (in Italian). Football Club Unione Venezia. 24 January 2013. Archived from the original on 24 July 2014. Retrieved 17 July 2014.
"Calciomercato biancorosso, Giani è del Perugia" (in Italian). AC Perugia Calcio. 23 January 2013. Archived from the original on 7 July 2014. Retrieved 17 July 2014.
Vicenza Calcio S.p.A. bilancio (financial report and accounts) on 30 June 2014 (in Italian), PDF purchased from Italian C.C.I.A.A. Archived 2014-04-30 at the Wayback Machine
"UFFICIALE: un nuovo volto in difesa per il Bellaria". Tutto Lega Pro (in Italian). Tutto Mercato Web. 31 August 2013. Archived from the original on 26 July 2014. Retrieved 17 July 2014.
"Calciomercato: tutte le operazioni delle scorse settimane" (in Italian). Vicenza Calcio. 2 September 2013. Archived from the original on 28 July 2014. Retrieved 17 July 2014.
"Chiusura compartecipazioni: tutte le operazioni" (in Italian). Vicenza Calcio. 20 June 2014. Archived from the original on 2014-07-04. Retrieved 17 July 2014.
"Numerazione maglie calciatori" (in Italian). Vicenza Calcio. 5 September 2014. Archived from the original on 2016-02-01. Retrieved 24 August 2015.
"Alle 12.00 conclusa la proroga del mercato: tutte le operazioni" (in Italian). Vicenza Calcio. 15 September 2014. Archived from the original on 2015-01-29. Retrieved 24 August 2015.