Just a matter of style, mostly (and leave two blank spaces after a period at the end of a sentence): To Whom It May Concern: This reference letter is provided at the written request of **** , who has asked me to serve as a reference on his behalf. I have known *** for the past eight months , as he has taken the *** course which I teach. As his professor, I have had an opportunity to observe the student’s participation and interaction in class and to evaluate the student’s knowledge of the subject matter.
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