I'd recommend you check in first with production and stage manager types in your area - these are the people who will, in all likelihood, be looking at your resume in the near future, so their thoughts on formatting and presentation would be great. Not only does it put you on their radar screens to ask for suggestions, it also lets them know you are interested in modifying your approach a little - that you want to learn from them.
That said, I would also suggest that you look at how "autoforms" put resumes together. Disney has a specific format for online applications - the details depend on the position, but the basic idea is that you list the company in a bullet, your role, the dates of the engagement, and then a detailed, concise list/explanation of what your responsibilities are. As a student myself, this formatting choice helps me break the ice with potential internship coordinators; rather than just saying I was the PA, I can make sure they know exactly what PA meant in a certain context.
If you'd like to see copy of my resume, PM me.
megf