reference letter after filling a harrasment complain

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Comments:
: after filing a complain, and I stated in my letter my intentions of resign, because of a co-worker behavior with me in the company year end party, I would like to know if I should ask for a reference letter in order to look for another job?, is this a right time?
: How should I answer in a job interview to the question,  Why did I leave that job?
: If I tell them about the harrasment would it has a negative impact in my presentation as a future worker there?