show/hide this revision's text 1 [made Community Wiki]

Get a letter from your current location unless you have a reason to believe it will hurt your current conditions. It does look bad for someone to have no reference about their current job. If you aren't sure, ask a local experienced confidant. Maybe you can get someone in your department to write a letter without telling your boss, if that is the problem. You aren't obliged to tell your boss until you are sure you are moving.