You're in luck! For top graduate business programs such as the MBA, where applicants have typically spent three or more years in the work force before applying, academic recommendations are actually discouraged. Ideally, you would want one recommendation from your current professional supervisor, and one from a previous supervisor who can add a different perspective on your career growth. Applicants from the non-profit sector are particularly prized in top b-schools, because of the diversity of perspective and community contribution that they bring to the classroom, so you have a lot of potential as an applicant.

Best of luck!
Margaret Strother