Diogenes of Apollonia
Links
Biography.com: Diogenes of Apollonia
http://search.biography.com/print_record.pl?id=8346
A brief biographical note on this Presocratic thinker.
Diogenes of Apollonia
http://www.bartleby.com/65/di/DiogenesA.html
Brief article from the 2001 Columbia Encyclopedia.