According to this link:
Reference information: The list should include at least three references, preferably from your most recent employers. Include name, title, company, business address, e-mail and phone (optional). Make sure contact information is current.
Job References: How to Format and Present Them
Since references are business or professional contacts, I would use the contact information that they use in their daily business. Especially for the email address, use the business email, not "hotstuff@yahoo.com" unless your reference owns a chili sauce factory.
