Bull's research interests span fields of history including social history, economic history, local history, and women and gender history, particularly from the era of 1978–1998. She has authored books, including Lokalsamfunnet i verden. Norske lokalsamfunns plass i den første globaliseringen på 1600- til 1800-tallet, and Trondheim 1814 Series: The Royal Norwegian Society of Sciences, Writings 1-2014.
