Walker, S., Spohn, C., DeLone, M. (2018). The Color of Justice: Race, Ethnicity, and Crime in America (6th ed.) Belmont, CA: Wadsworth.
Chapter 7: “Race and Sentencing: In Search of Fairness and Justice”
Chapter 8: “The Color of Death: Race and the Death Penalty”
Chapter 9: “Corrections in America: A Portrait in Color”
…… Potential sources
https://www.sentencingproject.org/the-facts/#map/#map
https://www.hrw.org/
https://deathpenaltyinfo.org/