A family of Microsoft word processing software products for creating web, email, and print documents.
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The Oxford reference style is not available by default in Word and needs to be added. You will only find a few reference styles added by default while others need to be downloaded and added to the Microsoft Word bibliography style directory.
In order to resolve this issue you may refer to the following Microsoft Answers link and check if you can manually download and install the Oxford reference style. Follow the set of steps as shown in the following link to search for and download the Oxford reference style:
Hope the above information helps to resolve the issue. Let us know the result.
Thank you.