John Marshall Harlan
- Biographical information with an emphasis on his ties to Princeton University.
- http://mondrian.princeton.edu/CampusWWW/Companion/harlan_john.html

Harlan Collection
- Information about Justice Harlan, his background, contributions to United States jurisprudence, and his famous dissent in Plessy v. Ferguson.
- http://www.louisville.edu/library/law/harlan/