Rujukan Opel

  1. 1 2 3 "Opel History". Opel. 1 March 2018. Dicapai 1 March 2018. 
  2. ↑ Opel Corporate Communications (2014). "Year in Review 2014 - Facts & Figures" (PDF). Opel. Adam Opel AG. Diarkibkan (PDF) daripada yang asal pada 25 July 2017. Dicapai 25 July 2017. 
  3. 1 2 "Facts". 
  4. ↑ "Statista". 2016. Dicapai 1 March 2018. 
  5. ↑ Mihalascu, Dan (25 May 2013). "OPC Boss Volker Strycek Drives and Talks About the Astra OPC". Carscoops. Carscoop & Carscoops. Dicapai 13 August 2013. 
  6. ↑ "Form 10-K Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the Fiscal Year Ended December 31, 2012 Commission File Number 001-34960 General Motors Company" (PDF). General Motors. General Motors Company. 15 February 2013. Diarkibkan daripada yang asal pada 6 August 2013. Dicapai 6 August 2013. 
  7. ↑ "PSA targets Opel turnaround as GM exits Europe". Reuters. 6 March 2017. Dicapai 1 March 2018. 
  8. ↑ "Locations & Facts". Opel. 1 March 2018. Dicapai 1 March 2018.