You should only use your references for positions of interest because you don't want to abuse your references with too many phone calls. Type your references on a piece of letterhead and include their names, job titles, organizations, and phone numbers. Be prepared to take these on your job interviews. Letters of recommendation can be appropriate when your experience was from a different state or country and the individuals would be hard to reach. Most employers prefer speaking personally with references.
Employers know that some employers ask employees to write their own letters of recommendation.