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| Phi Sigma Pi National Website http://www.phisigmapi.org/ The Big Daddy website. |
| Central Missouri State University http://www.cmsu.edu/ Information on the colleg that gave birth to Phi Sigma Pi. |
| Brothers Are We http://www.brothersarewe.org/ Threaded discussion boards, interchapter event calendars, and more. |
| Burr, Patterson, & Auld Co. http://www.burrpatt.com/ Official jeweler of Phi Sigma Pi. |
| UBGREEK http://www.ubgreek.com/ Official Phi Sigma Pi sportswear |
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