independent letter must come from same field?

來源: laojiadongbei 於 2006-10-24 13:23:35 [] [舊帖] [給我悄悄話] 閱讀數 : (254 bytes)

Hi,
I am preparing reference letter for NIW .Dose anybody here know if the independent reference must come from a person who works in the same field? For example,if my background is in pharmacology, should I use some one from pharmacology only?Thanks.

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