The index of viola music / compiled and edited by Wayne Wilkins.
Magnolia, Ark. : Music Register, 1976, and supplements to 1978
MUSIC Ref ML128.V36 W5
Literatur für Viola / Franz Zeyringer
Hartberg : Schönwetter, 1976
MUSIC Ref ML128.V36 Z5 1976
Music for viola / Michael D. Williams
Detroit : Information Coordinators, 1979
MUSIC Ref ML128.V36 W53
String music in print / by Margaret K. Farish
New York : R. R. Bowker Co., 1965, and supplements to 1984
MUSIC Ref ML128.S7 F4
Journal of the American Viola Society, v. 3 (1987)-v. 10 (2001) ML900.V62
Die Viola : Jahrbuch der Internationalen Viola-Forschungsgesellschaft, 1979-1984 ML5.V564x
American string teacher, v. 8 (1958)- ML27.U5A8356
The Strad, 1991- ML749.5 S773x
M - Scores
M45-49--Solo viola music
M224-228--Music for viola and piano
M1014-1015, M1114-1115--Viola with orchestra and string orchestra (includes full scores and solos with piano arrangements)
ML - Music Literature
ML128.V36--Viola music: Bibliography
ML900-905--Books about the viola
MT - Instruction and Study
MT280-298--Methods, etudes, orchestra studies, etc.
Viola music
Viola and piano music
Suites (Viola)
Concertos (Viola)
Concertos (Viola with string orchestra)
Viola with orchestra
...and there are lots more. Do a subject search for "viola" and see the 144 different subject headings that begin with "viola."
Viola music--Bibliography
Viola--History
Violists
... and lots more. Search "viola" in the library catalog and find more than 250 books, more than 1000 recordings and more than 1500 scores.