During the job application process, you will most likely be asked for references who can attest to your qualification for the job. Typically, this request either occurs when you initially submit your job application, or later in the application process, when the hiring manager is close to making the decision about which candidate will get the job. The employer will typically specify how many references to include on your list, as well as what contact information you need to provide for each reference.
You will need to format your list of professional references either to include with your application materials, or else to email to the hiring manager later on in the hiring process. The employer will typically advise you on how and when to provide references.
As with all communication with a potential employer, from cover letters to thank you notes, your list of references should be formatted professionally, easy to read and understand, and free of any typos or errors. Here is information on what to include on your list of references, and how to format the page.