Die Streitschriften Hinkmars von Reims und Hinkmars von Laon 869-871, 2003.
Hincmar of Laon and Carolingian politics, c1978.
New Catholic encyclopedia, 2nd ed. (Hincmar of Laon; Bishop, d. 879; nephew of Hincmar, Archbishop of Reims)
Wikipedia 24 Feb. 2014 (Hincmar, called the Younger (died 879), was the bishop of Laon from 858 until his death. He was a nephew on his mother's side of Archbishop Hincmar of Reims)