William W. Campbell, Delaware Historical Society, Wilmington, 1909*"Soldier-Statesmen of the Constitution", by Robert K. Wright, Jr. and Morris J. MacGregor, Jr., Center of Military History, United States Army, Washington, D.C., 1987*McCullough Family notes.
William W. Campbell, Historical Society of Delaware, Wilmington, 1909* Soldier-Statesmen of the Constitution, by Robert K. Wright, Jr. and Morris J. MacGregor, Jr., Center of Military History, United States Army, Washington, D.C., 1987