This webinar introduces Guide to Reference, an online resource that evaluates over 17,000 authoritative reference sources across many disciplines. It can help with reference, collection development, and teaching. The Guide stands out for its in-depth annotations by subject experts, breadth of coverage, and ability to search, customize lists, and save searches. It addresses current challenges in reference, collections, and instruction by providing evaluative guidance on high-quality sources. The webinar demonstrated how to browse and search the Guide and leverage features like Editor's Guides to support work.