ALA Library of Congress Romanization Guides
The American Library Association and the Library of Congress work together to create rigid systems for romanizing or transcribing languages written in non-roman scripts. The link below takes you to the guides for languages in Southeast Asia, and other parts of the world. These are the systems you will need to use to find books in the catalogs.
ALA/LC Romanization Guides Scroll down to find the table listing the various languages