Libby wrote several books on sports figures including Fran Tarkenton, O.J. Simpson, Fred Lynn, Rod Carew, Pete Rose, Catfish Hunter, Willie Stargell, Wilt Chamberlin, Phil Esposito, Rocky Marciano, and A.J. Foyt as well as books on hockey, auto racing, professional football, and college football.

 

He also co-wrote several books on celebrities and sports people including Nancy Reagan, the Roosevelt family, Monty Hall, Vida Blue, Nolan Ryan, John Roseboro, Jerry West and Richard Petty.