Butler Libraries use the Library of Congress classification system. There are sections specifically for Canadian literature (PS 8001-8599), German literature (PT1-4897), Romance languages (French/Italian/Spanish/Portuguese) literature (PQ1-9999), etc. Several popular World literature titles are classified into the end of the English literature call number range:
PR 8309 - PR 9680
"World Literature" is very broadly defined. Many specific primary source collections exist, but identifying them can be tricky. Reach out to your liaison librarian for individual research support.
Email Butler University Libraries
Irwin Library: 317-940-9227
Science Library: 317-940-9937
CAT: 317-940-8575