[S90] Lafayette County Historical Society, Continuing the History of Lafayette County, (Higginsville, Missouri: Lafayette County Historical Society, 2002), volume 1, page 392.
Biographical sketch of the "Erdman Brothers." Submitted by Ruth (Moore) Hader and Roger Erdman. Children of William Erdman and Wilhelmina Hader who survived to adulthood were: "Walter, who married Edmona Breckenridge."