A Day with Diogenes: A fictional dialogue by Terry Ballard.
Diogenes and Alexander: Drawing by Honore Daumier (1842).
Diogenes of Sinope: Article and anecdotes about his way of life by Ben Best.
Diogenes the Cynic: A few stories about "The Dog".
Ethics of Isocrates, Aristotle, and Diogenes: An article about his life and context by Sanderson Beck.
Internet Encyclopedia of Philosophy: Diogenes of Sinope: Biography and analysis.
The Cynic Philosophers: The way of life of Diogenes, by Michel Foucault.