Bates, David and Liddiard, Robert, eds. (2013) East Anglia and its North Sea World in the Middle Ages. Boydell and Brewer, Woodbridge. ISBN 9781843838463
Dallas, Patsy, Williamson, Tom and Last, Roger (2013) Norfolk Gardens and Designed Landscapes. Windgather Press. ISBN 978-1-905119-92-9
Liddiard, Robert and Williamson, Tom (2013) Gardens and the Larger Landscape. In: A Cultural History of Gardens in the Medieval Age. A Cultural History of Gardens . Bloomsbury Academic, pp. 167-184. ISBN 978-0-8578-5050-0
Liddiard, Robert, Williamson, Tom and Partida, Tracey (2013) Champion: The Making and Unmaking of the English Midland Landscape. Exeter University Press.
Rowe, Anne and Williamson, Tom (2013) Hertfordshire:A Landscape History. University of Hertford Press. ISBN 978-1909291003
Spooner, Sarah and Williamson, Tom (2013) Gardens and the Larger Landscape. In: A Cultural History of Gardens in the Age of Enlightenment. A Cultural History of Gardens . Berg Publishers, pp. 193-246. ISBN 9781847882653
Stone, Adam and Williamson, Thomas (2013) 'Pseudo-Ancient Woodland' and the Ancient Woodland Inventory. Landscapes, 14 (2). pp. 141-54.
Williamson, T. (2013) Landscape into Art:Painting and Place-Making in England, c.1760-1830. In: A Companion to British Art: 1600 to the Present. UNSPECIFIED, pp. 373-396. ISBN 9781405136297
Williamson, Thomas (2013) East Anglia's character and the "North Sea World". In: East Anglia and its North Sea World in the Middle Ages. Boydell Press, Woodbridge, pp. 44-62.
Williamson, Thomas (2013) An Environmental History of Wildlife in England 1650-1950. Bloomsbury Academic, London. ISBN 10: 144-1-124-86-1
Williamson, Thomas (2013) A pipeline trench at Houghton Hall. Norfolk Archaeology, XLVI. pp. 526-538.
Williamson, Tom (2013) Environment, Society and Landscape in Early Medieval England:Time and Topography. Anglo-Saxon Studies . Boydell Press, Woodbridge. ISBN 978-1843837374
Williamson, Tom, Spooner, Sarah and Gregory, Jon (2013) Lancelot ‘Capability’ Brown: A Research Impact Review:Prepared for English Heritage by the Landscape Group, University of East Anglia. English Heritage Research Reports . English Heritage.