Kleinhans M., Verkade A., van Wessel T., Bastings M., Marra W., van Gog T., van Westrenen W., & Reichwein M. (2015). Moon, Mars and Mundus: primary school children discover the nature and science of planet Earth from experimentation and extra-terrestrial perspectives. Netherlands Journal of Geosciences, 95(2), 203-214. https://doi.org/10.1017/njg.2015.2