1. Former Employer
A previous employer can provide the best insight into your work ethic. They know what your responsibilities were at your job and how you handled them.
Someone who supervised you, but wasn’t necessarily your boss. This could be a supervisor from a volunteer project, an internship or some other extracurricular activity. Any of these people spent a lot of the time working with you to get a sense of your character, and probably your passions.
3. Professor/ Teacher
A teacher or professor can provide a really strong reference, especially if they taught a course pertinent to your major. They will be able to talk about the skills you picked up during their course, as well as your personal characteristics.
督促你的人不一定是你的老板。 他/她也可以是一个志愿者项目，实习或其他课外活动的主管。 这些人都长时间与你一起工作所以他们会更加了解你的性格与工作的激情。
3. 教授 / 教师