Credo Reference Credo Reference is an online full-text library that covers all major subjects such as art, business geography, history, literature, music, psychology, social Sciences, and technology. It includes general reference resources such as dictionaries, bilingual dictionaries, thesauri, encyclopedias, and atlases, plus a wide range of subject-specific titles covering everything from art to zoology. It offers easy keyword searching across the database of resources so you don’t need to know the title of a specific reference book to get started. Search in hundreds of encyclopedias, dictionaries, thesauri, quotations, and subject-specific titles, as well as 200,000+ images and audio files, and nearly 200 videos.