Segers, Grace Crawford, Jan (February 7, 2019). "Supreme Court Chief Justice John Roberts joins liberal justices to block Louisiana abortion clinic regulation". Greenburg, Jan Crawford (September 30, 2007). "Clarence Thomas: A Silent Justice Speaks Out". Abraha, Henry (2007). Justices, Presidents, and Senators: A History of the U.S. Archived from the first on 9 August 2017. Retrieved 26 October 2007.