The Best Option is for your current supervisor to write your letter of recommendation. If somehow it is not possible then you should go for the ex-supervisors and if the requirement is 2 or 3 recommendation letters then you can seek help from managers or employees. But usually, many universities ask for a single recommendation letter from an academic connection, and if supervisors or ex-supervisors give then it would be great. Make sure to request the recommendation letter you should hire any
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