How to write a reference letter for student?

I have just passed my pre-entrance exams to LPN school and have been asked to attend a personal interview in 2 weeks. Prior to the interview, I need to have 3 letters of refrence sent to the school along with a 2x2" pic for my file. I have a Pharmacist writing one letter for me, but for the other 2 refrences, who do I ask (friend or professional) and what should be included in recommending me for a nursing program?

The prior post brings up an interesting point. I always send my letter to the person who requests it, so he/she can read it and make a copy if wanted, before giving it to the potential employer...

Vicky, as usually, that is great. BUT: what if they were not a great student

I have a couple of form letters that I tweak for each student. I have the excellent student, the satisfactory student and the "just barely getting by" student (who is really trying but not doing so great. I have also been asked to write letters for students who have failed, that are looking to get a hospital-related job or an externship while they are waiting to repeat the course. In these cases, I keep it very objective, what they have passed or completed in the program, and their clinical performance (if they were satisfactory in clinical for me, but not theory). I will discuss their character (caring, compassionate, good communicator, team player, etc).

I also include anything 'special' they have done, projects, extra assignments, externships, class officer, etc