I'm writing a research paper on the topic for a college English class, but have experienced considerable difficulty finding really strong, credible sources discussing the issue. So far I've found that Ford, GM, ITT, IBM as well as Rockefeller owned Standard Oil and Chase Bank had a hand in supporting up the Nazi war effort. Problem is that many of sources I've came across don't appear to be the most reliable.
Nazi Nexus: America's Corporate Connections to Hitler's Holocaust by Edwin Black. Edwin Black is a scholar that has done great work elsewhere on Nazi Germany and eugenics in the US, and several other subjects