Philosopher's Index This link opens in a new windowThe premiere bibliographic database covering worldwide research in all subject areas of philosophy. It contains works on philosophy from both philosophy and interdisciplinary sources. There are author-written abstracts for most records. The global database contains more than 680,000 records with source publications from 139 countries in 37 languages. The primary languages are English, French, German, Italian, and Spanish. Primary coverage spans from 1940 to present with additional records dating back to 1893.