What primary/secondary sources can be used when writing a dissertation on Eisenhower and his engagement with the Civil Rights Movement?

Jul 2019
1
England
President Eisenhower is not famously known for his engagement with the Civil Rights Movement. However, upon inspection, he surprisingly contributed a significant amount to the advancement of black civil rights during his presidency. This is why I want to write my university dissertation on how far Ike engaged with the Civil Rights Movement but would like to see some suggestions on primary/secondary source material that I could access.