Whitaker was a four-weight world champion, having won titles at lightweight, light welterweight, welterweight, and light middleweight; the undisputed lightweight title; and the lineal lightweight and welterweight titles. He holds the longest unified lightweight championship reign in boxing history at 6 title defenses. Whitaker was seen as one of the greatest defensive boxers of all-time.
- "The Lineal Boxing World Champions". The Cyber Boxing Zone Encyclopedia.
- "Floyd Mayweather Jr. and 25 Best Defensive Boxers in History". Bleacher Report.
- "Pernell Whitaker Dead At 55, Boxing Legend Hit By Car". TMZ. Retrieved 2019-07-15.