Music scholars also use:
Thematic Catalogs provide an organized lists of composer's works.
A thematic catalogue is an index to a group of musical compositions that incorporates citations of their opening notes (incipits), or principal melodic features (themes), or both. These citations may be given in various forms, such as conventional notes, neumes, tablatures, syllables, numbers, letters or computer codes. Brook, Barry S. 2001. "Thematic catalogue" Grove Music Online. 23 Aug. 2018.
Why use a thematic catalog? Thematic catalogs can help you locate individual works in a composer's collected edition. They also contain a lot of useful information on the primary sources (manuscripts, early editions) of a composer's works.