Phi Kappa Sigma - Official Site
- International social fraternity founded by Samuel Brown Wylie Mitchell at the University of Pennsylvania on August 16, 1850.
- http://www.pks.org/
Phi Kappa Sigma - Ohio University - Beta Zeta Chapter - Founded in Athens, Ohio, as Alpha Delta Omega on January 9, 1950 and chartered as BZ chapter of Skulls on November 29, 1953. - http://www.ohiou.edu/~skulls/