Character Reference Letter

[Plutonium]

Can someone direct me or provide a link that explains what a character reference letter should be like? I would like to email my peer, who is doing my letter, so he can have a better idea of what it should be like.
I haven't had much luck searching in google.

Thanks guys

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[Bovary]

This is what the AAMC says:
https://www.aamc.org/download/332578/data/lettersguidelinesbrochure.pdf