Michael Mann 
Macmillan Student Encyclopedia of Sociology [PDF ebook] 

The Macmillan Student Encyclopedia of Sociology is a major comprehensive encyclopedia aimed at all students of social science. The book explains all the important sociological terms, theories, concepts and proper names, whether they come from the classic nineteenth-century traditions or from recent radical trends, from the realms of abstract theory to issues of immediate social concern. There are over 2000 entries, arranged in alphabetical order. All entries start with simple concise definitions but many go on to provide full-length original essays.