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depends how much you value having him/her as a reference.
face to face > phone > email
if you've got a long list of people that could be your reference, i'd just email. but with only one, i'd go the extra mile and just pay him a visit. not sure if this rings true for eveyone else, but it's always easier for me to turn someone down in an email.
also, references don't always have to be from a manager or supervisor. a colleague will work just as fine cause all they have to prove is that you've worked there before.
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