Catholic Encyclopedia: Cyrenaic School of Philosophy

Overview of this strain of classical thought, by William Turner.
http://www.newadvent.org/cathen/04591a.htm

Hellenicdata: Cyrenaic

A concise article drawn from the online Britannica.
http://kat.gr/Kat/History/Greek/Id/Cyrenaic.htm

Voula Tsouna, The Epistemology of the Cyrenaic School

A review by Robert Todd of this scholarly work. Published in the Bryn Mawr Classical Review in 1999.
http://ccat.sas.upenn.edu/bmcr/1999/1999-10-02.html

Columbia Encyclopedia: Cyrenaics

Concise paragraph from the 2001 edition.
http://www.bartleby.com/65/cy/Cyrenaics.html

Internet Encyclopedia of Philosophy: Cyrenaics

Detailed survey of this school of thought, by Tim O'Keefe.
http://www.iep.utm.edu/c/cyren.htm