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Dear Ms / Mr XXX,
Letter of Resignation
I regret to inform you that I need to resign from my post of XXX because of personal reason. I hereby give you XXX days notice which effective on XXXXX.
Thank you for giving me the chance to learn and I really feel regret to leave your team. However, I need to further my study / enhance my career aspects / take care my family, as a result, resignation is the only choose.
I would be very grateful if you can give me a reference letter befor I leave. Once again, thank you for giving me the chance to work with your team in the past XX years.
Regards,
XXXXXXX
Title
Date: XXXXXX