Consult these printed indexes and guides:
If you want to find short stories by a particular author, do either an author alphabetical (last name first) or author keyword search for that author.
To find short story collections in the library try doing a genre/form alphabetical search for the term "short stories" followed by the adjective for the country or region. For example: short stories, latin american; short stories, mexican; short stories, spanish.
Also try searching by subject alphabetical in the same way.