You need to have both. Obviously, you should have more professional than personal. But a minimum of three overall is a must. You might as well be prepared.
Nothing catches an employer's attention more than a lack of references.
For your professional references, try to include at least one contact from each of your past employers. It is important that you always ask the reference if they'd feel comfortable providing a reference for you. Or, list a sports teammate who can attest to the fact that you are an awesome team player with natural leadership abilities. What ever you do, don't list your mother, grandmother, neighbor, or the nice guy at the deli who compliments your happy disposition. Keep in mind that potential employers interested in hiring you WILL check your references.