Barnes, G and Williamson, Tom (2011) Ancient Trees in the Landscape: Norfolk's Arboreal Heritage. Windgather Press, Oxford. ISBN 978-1-905119-39-4
Liddiard, Robert (2011) English Castle-Building. In: Princely Rank in Late Medieval Europe, Studien zu politischen und sozialen Ordnungen im Mittelalter. Thorbecke, Ostfildern, pp. 199-225.
Rowe, Anne, Taylor, Christopher and Williamson, T. (2011) The earthworks at Benington Park, Hertfordshire:An exercise in dating an 'archaeological garden'. Landscape History, 32 (2). pp. 37-55. ISSN 0143-3768
Williamson, Tom (2011) Estate landscapes in England:interpretive archaeologies. In: Interpreting the Early Modern World. Springer, New York, pp. 25-42. ISBN 978-0-387-70758-7
Williamson, Tom (2011) The Origins of Hertfordshire. In: An Historical Atlas of Hertfordshire. University of Hertfordshire Press, pp. 10-12. ISBN 978-0-9542189-6-6
Williamson, Tom and Rowe, A (2011) Relief. In: An Historical Atlas of Hertfordshire. University of Hertfordshire Press, pp. 6-8. ISBN 978-0-9542189-6-6