Pettitt, Paul. „The Origins of Human Visual Culture: A Three-Stage Hypothesis from Babble to Concordancy to Inclusivity“. The Beef Behind All Possible Pasts: The Tandem Festschrift in Honour of Elaine Turner and Martin Street, herausgegeben von Sabine Gaudzinski-Windheuser und Olaf Jöris, Propylaeum, 2021, S. 229-47, https://doi.org/10.11588/propylaeum.868.c11316.