(原始内容存档于2012-03-15). Prius c hybrid goes on sale in US with entry MSRP of $18,950; new transaxle, motor technology. Green Car Congress. 2012-02-08 [2012-02-11]. (原始内容存档于2012-02-11)
Brendan M.; Savagian, Peter J. The GM "Voltec" 4ET50 Multi-Mode Electric Transaxle. SAE International – Technical Papers (SAE International). April 12, 2011