@book{ Solr-150645, title = {The challenge of informal education : extending young children's learning in the open classroom / (by) Moira McKenzie and Wendla Kernig.}, series = {Education in practice}, author = {McKenzie, Moira}, editor = {Kernig, Wendla}, address = {London}, publisher = {Darton, Longman and Todd}, year = {1975}, }