Ruff, Erwin. “A Study of Five Songs of Charles Ives.” M.A. thesis, Eastman School of Music, The University of Rochester, 1942.

Ives, Charles. “Letter to the Sun.” New York Evening Sun, September 10, 1922.

Siebert, Mark. “They Are There: A War Song March, 1917.” Notes 20, no. 4 (1963): 565-566.

Woodward, Henry. “Processional: Let There Be Light.” Notes 13, no. 2 (March 1956): 349.

Kammerer, Rafael. “Orchestras of America Offers Lincoln Program.” Musical America 80, no. 3 (March 1960): 24.

Kerner, Leighton. “Lilacs in Bloom.” The Village Voice 26, January 28, 1981, 66.

Wells, William B. “Sacred Choral Octavos” and “Psalm 150.” Notes 30, no. 3 (1974): 634-640.

Siebert, Mark. “Psalm XXIV.” Notes 14, no. 4 (September 1957): 618-619.

Harris, Roger. “Review of The Celestial Country.” Music and Musicians 27, no. 10 (June 1979): 64+.

Koch, Gerhard R. “‘Das himmlische Land’ von Ives.” Musica 29, no. 3 (1975): 230-233.