Engineering Information released an expansion of the Referex eBooks database, delivering three times more engineering reference content to engineering researchers. Referex is a reference database comprised of professional reference content sourced from Elsevier's books publishing program. Referex provides engineering researchers with answers to their reference questions and is hosted exclusively on the Engineering Village discovery platform. The Referex expansion features the introduction of over 480 new titles to existing collections in Electronics and Electrical Engineering, Mechanical Engineering and Materials, and Petrochemical, Chemical and Process Engineering. Three new Referex collections have been created covering Civil and Environmental Engineering, Computing, and Security and Networking. Like the existing collections, these new Referex collections are comprised of selected titles geared toward professionals and practitioners.