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.