Brooks, William, and Burkholder, J. Peter. Typescript. “Books in Bigelow Ives’ Library and Identified by Him as Belonging to Charles Ives or His family.” Spring 1982, revised March 1984.
Sole, K. G. A Study and Performance of Five Psalm Settings and “The Celestial Country” by Charles Edward Ives.” D.M.A. diss., University of Southern California, 1976.