If you accessed a thesis or dissertation online, give either a URL or DOI at the end of the reference. The exact format depends on which you give:
For a URL (i.e., a regular web address), include “[Online]” and the URL itself with no final punctuation at the end of the reference.
For a DOI, add the DOI after a comma and end the reference with a period.
You can see examples of both styles below:
 C. P. Clark, “A digital forensic management framework,” MSc Dissertation, Dept. of Comput. Sci., Univ. of Sheffield, Sheffield, UK, 2020. [Online]. Available: http://etheses.whiterose.ac.uk/1923/
 B. S. Bello, “Reverse engineering the behaviour of Twitter bots,” PhD Thesis, School of Informatics, Univ. of Leicester, Leicester, UK, Year, doi: 10.25392/leicester.data.12662456.v1.
Otherwise, though, the reference format is the same as shown above.
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