An exciting new enhancement to our library catalogs - Encore and the Classic Catalog - is enabling users to limit searches to just the Reference Collection.
In Encore, perform a search and then select the facet - Reference - in the Refine By: menu under Collection. This will return just the items which are in one of the print reference collections or which have been marked as Online Reference.
In the Classic Catalog, the feature is available in author, title, subject and genre searches. In the "View Entire Collection" drop down box, change the selection to "Reference".