Monster I found a rule for possessives.
Intra _ Mural Sports Teams is descriptive so there is no apostrophe. You were right.
I know you have changed your banner but I thought this an interesting rule page anyway.
Descriptive Phrases (weird!)
One of the strangest rules in the AP stylebook insists that certain things are not possessives (even though they look like possessives) but are "descriptive."
As such, they do not deserve apostrophes.
Such as it is, here's the logic behind the rule:
- students handbook
- It's a handbook for students, not a handbook belonging to students
- teachers college, writers guide
- The same twisted logic applies
Here are other examples from the stylebook. Notice the absence of apostrophes:
- citizens band radio
- a Cincinnati Reds infielder
http://www.newsroom101.com/NR_exerci...un_lesson.html