Look in the reference section under ML128.C48 and ML128.V7 for bibliographies and repertoire lists for choruses. As an example:
Shrock, Dennis. Choral repertoire. Oxford : Oxford University Press, 2009. MUSIC REF ML128.C48S57 2009
Secular choral music in print. Philadelphia : MusicData, 1987. 2nd ed. MUSIC REF ML128.V7D3 1987 and supplements
Sacred choral music in print. Philadelphia : MusicData, 1985. MUSIC REF ML128.V7E78 1985 and supplements
Tudor church music. Oxford University Press, 1923- M2T9
The English madrigalists, ed. by Edmund H. Fellowes. Stainer & Bell. M2F413
Early English church music. Stainer & Bell. M2E12
Das Chorwerk, herausgegeben von Friedrich Blum. Möseler Verlag. M2C6325
M-Scores
M1530-1600 -- Secular choral music
M2020-2101.5 -- Sacred choral music
ML-Books
ML1499-1554 -- Choral music
MT-Musical instruction and study
MT110-115 -- Analysis and appreciation of musical works. Oratorios, cantatas, etc.
