Damien (Goldsmiths College, University of London, UK) Keown & Charles S. (Utah State University, USA) Prebish 
Encyclopedia of Buddhism [PDF ebook] 

Reflects the current state of scholarship in Buddhist Studies, its entries being written by specialists in many areas, presenting an accurate overview of Buddhist history, thought and practices, most entries having cross-referencing to others and bibliographical references. Contain around 1000 pages and 500, 000 words, totalling around 1200 entries.