If you're applying for a job where the employer has requested references on your resume, include them on a separate page. This approach appears more professional than trying to cram your references onto your one-page resume.
When providing the company with references, don't list your references on your resume. Instead, include a separate, attached page with a list of three references (or whatever number the company asks for) and their contact information.
If this is unknown, then, “Dear Sir or Madam,” will suffice. Add the job reference. Before you start the body of the letter, add any reference that has been given for the job application, for example, “Re: Engineering Trainee, Eastern Division” or “ Ref – HR/004.” Introduce your CV in two or three short paragraphs.
Include your phone number and email address in your closing paragraph to make it easier for them to reach out to you immediately. Finally, include an appropriate letter of application sign-off such as “Sincerely” or “Best Regards,” followed by your name.
List the reference number, if applicable. If your letter refers to an existing matter, you may have a reference number or case number. Featuring this number prominently will help your recipient relate the letter to your previous correspondence. A reference number could look like this: Ref: #08923.
Reference numbers should be inserted to the left or inside of colons and semi-colons. Reference numbers are generally placed outside or after full stops and commas - however, check with your faculty/journal publisher to determine their preference.