Butt, Graham. MasterClass in Geography Education: Transforming Teaching and Learning. Bloomsbury Academic, 2015.
Hart, Kathleen. ‘Chapter 7, Ratio and Proportion’. Children’s Understanding of Mathematics, 11-16, John Murray, 1981, pp. 88–97, https://contentstore.cla.co.uk/secure/link?id=8c863559-bf1d-e611-80bd-0cc47a6bddeb.
Jones, Mark. The Handbook of Secondary Geography. Geographical Association, 2017.
Lambert, David, and Mark Jones. Debates in Geography Education. Routledge, 2013.