McDonald, Jo (1 June 2017). "Discontinuities in arid zone rock art: Graphic indicators for changing social complexity across space and through time". Journal of Anthropological Archaeology. Archaeological discontinuities: Comparative perspectives for the southern hemisphere. 46: 53–67. doi:10.1016/j.jaa.2016.08.005. ISSN0278-4165.
McDonald, Jo (1 June 2017). "Discontinuities in arid zone rock art: Graphic indicators for changing social complexity across space and through time". Journal of Anthropological Archaeology. Archaeological discontinuities: Comparative perspectives for the southern hemisphere. 46: 53–67. doi:10.1016/j.jaa.2016.08.005. ISSN0278-4165.