Ask them to provide references from other, similar companies they've helped in the past.

It provides an important reference to medical history in case of emergency.

By providing known references they help make sense out of a new phenomena.

The students also had to provide references and were interviewed by three adults at the school.

We provided additional references in some areas to clarify our position.

The book provides a reference to the scientific understanding and preparation of food.

I can easily provide references for text books, if you are more interested in how these operations actually work.

The Internet should provide almost endless references to the pollution problems in which you have interest.

Gray and Meyer provide a general reference for this circuit.