Charles, Sydney Robinson. 1974. Hillary-Hyllayre: How Many Composers? Music and Letters, 55: 61-9.

Charles, Sydney Robinson. 1972. A Handbook of Music and Music Literature in Sets and Series.  New York.

Charles, Sydney Robinson (ed.) 1967. The Music of the Pepys MS 1236. Corpus mensurabilis musicae.  Neuhausen nr. Stuttgart: American Institute of Musicology.

Charles, Sydney Robinson. 1962. The Provenance and Date of the Pepys Ms 1236. Musica Disciplina, 16: 57-71.

Charles, Sydney Robinson. 1959. The Music of the Pepys Ms 1236. Unpublished Ph.D. dissertation, University of California at Berkeley.