Active: 5 Common Hip Injuries You Can fix, http://beta.active.com/running/Articles/5-Common-Hip-Injuries-You-Can-Fix
Runners World: Runner’s Guide to the Psoas, http://www.runnersworld.com/injury-treatment/runners-guide-psoas
American Running Association: Groin Pain, Starting After a Run, http://www.americanrunning.org/w/article/the-clinic-groin-pain-starting-after-a-run
Core Performance: The Complete Guide to Groin Strains, http://www.coreperformance.com/knowledge/injury-pain/groin-strain.html
Beginner Triathlete: Common Causes of Hip and Pelvic Pain in Runners, http://www.beginnertriathlete.com/cms/article-detail.asp?articleid=1383
Sports Injury Clinic: Buttock, Hip and Groin Pain, http://www.sportsinjuryclinic.net/sport-injuries/hip-groin-pain