The index of cello music : including the index of baroque trio sonatas / compiled and edited by Wayne Wilkins.
Magnolia, Ark. : Music Register, 1979
MUSIC Ref ML128.V5 W5
The solo cello : a bibliography of the unaccompanied violoncello literature / Dimitry Markevitch
Berkeley, Calif. : Fallen Leaf Press, 1989
MUSIC Ref ML128.V5 M28 1989
Bibliography of cello ensemble music / by Claude Kenneson
Detroit : Information Coordinators, 1974
MUSIC Ref ML128.V5 K45
String music in print / by Margaret K. Farish
New York : R. R. Bowker Co., 1965, and supplements to 1984
MUSIC Ref ML128.S7 F4
M - Scores
M50-54--Solo violoncello music
M229-236--Music for violoncello and piano
M1016-1017, M1116-1117--Violoncello with orchestra and string orchestra (includes full scores and solos with piano arrangements)
ML - Music Literature
ML128.V5--Violoncello music: Bibliography
ML910-915--Books about the violoncello
MT - Instruction and Study
MT300-318--Methods, etudes, orchestra studies, etc.
Violoncello music
Violoncello and piano music
Suites (Violoncello)
Concertos (Violoncello)
Concertos (Violoncello with string orchestra)
Violoncello with orchestra
...and there are lots more. Do a subject search for "violoncello" and see the 105 different subject headings that begin with "violoncello."
Violoncello music--Bibliography
Violoncello--History
Violoncello--Instruction and study
Violoncellists
... and lots more. Search "violoncello" in the library catalog and find more than 50 books, more than 1600 recordings and more than 2400 scores.