References are professional contacts who will vouch for you when a prospective employer calls them in the future. You need to include 2-4 references on job applicaitons in order to get a job! 

Work experiences (paid jobs, internships, volunteer work, civic involvement, and even some extra-curricular activities) is where people get strong references from. If you perform well and give ample notice before leaving a job, you will likely get one or more good references from each work experience.

For more information, review the following resources: