Instead of just supplying a standard reference sheet, add a "one-liner" from each reference, a quotation that summarizes a particular qualification or skill. It should be a one-line quote that gives personal insight into an element of your background that normally would not surface in the impersonal form of the standard resume/cover letter/references-type materials. You might be able to pull the quotation from a letter of reference or from a conversation with the person. If you are quoting verbal conversation, make sure you quote accurately and confirm the quote with the person—no paraphrasing allowed unless the person approves the changes.
Following are some examples:
"I am confident Julie will be an outstanding Accountant."
"Tom is the brightest student I have ever known."
"I could always count on Anne for our toughest projects."