Biographical dictionary of twentieth-century philosophers/ edited by Stuart Brown, Diane Collinson, Robert Wilkinson. 

London; Routledge, 1996 xx, 947 p. 

97-185841 109/.2 B 21 0415060435 

B104.W67 2000 

World philosophers and their works/ editor, John K. Roth; managing editor, Christina J. Moose; project editor, Rowena Wildin. 

Pasadena, Calif.: Salem Press, c2000. 3 v. 

99-055143 109 0893568783