Hello Sona,
There really is not a book that teaches you how to write a research report. However, if there is a local brokerage firm in your city (Barclays, UBS, Citigroup) I would ask the firm if you can have a copy of one of their reports. I also am happy to send you a version of one of my old spreadsheets so that you can look at it.
With smiles,
Jason