Robert Sorokanich (1. 12. 2014). „BMW Will Make Plug-In-Hybrid Versions of Every Major Model”. Car And Driver. Архивирано из оригинала 08. 12. 2015. г. Приступљено 30. 11. 2015. „The company announced today that it will spread the plug-in-hybrid tech [...] across all of its models.”
Stephen Edelstein (3. 12. 2013). „BMW’s ‘Oberklasse’ 2016 5 Series will thankfully mark the end of the boring Bimmers”. Digital Trends. Приступљено 30. 11. 2015. „Under the new sheet metal will be an equally new platform dubbed OKL (Oberklasse or “luxury class”), which will form the basis for many of BMW’s future models, including the next 6 Series and 7 Series, [...].”
Robert Sorokanich (1. 12. 2014). „BMW Will Make Plug-In-Hybrid Versions of Every Major Model”. Car And Driver. Архивирано из оригинала 08. 12. 2015. г. Приступљено 30. 11. 2015. „The company announced today that it will spread the plug-in-hybrid tech [...] across all of its models.”
