Bethell, EJ and Pfefferle, D (2023) Cognitive bias tasks: A new set of approaches to assess welfare in nonhuman primates. In: Robinson, LM and Weiss, A, (eds.) Nonhuman Primate Welfare: From History, Science, and Ethics to Practice. Springer International Publishing, pp. 207-230. ISBN 9783030827076

Cassidy, LC, Bethell, EJ, Brockhausen, RR, Boretius, S, Treue, S and Pfefferle, D (2021) The dot-probe attention bias task as a method to assess psychological wellbeing after anesthesia: A study with adult female long-tailed macaques (Macaca fascicularis). European Surgical Research. ISSN 0014-312X

Bethell, EJ, Cassidy, LC, Brockhausen, RR and Pfefferle, D (2019) Toward a Standardised Test of Fearful Temperament in Primates: a Sensitive Alternative to the Human Intruder Task for Laboratory-Housed Rhesus Macaques (Macaca mulatta). Frontiers in Psychology. ISSN 1664-1078