Rashmirathi is a poem written on Karna by great poet Ramdhari Singh Dinkar.
Rashmirathi stands for Sun Charioteer. In Rashmirathi Dinkar covered Karna's complete life and each word touches your heart. Parts dedicated to Karna-Krishna Smwaad, Karna-Kunti Smwaad and Fall of Karna touches bottom of heart.
According to me this is the best book dedicated to Karna.
You can read this poem online
Read Rashmirathi Online.