Geary, David C.; Wiley, Judith G. (1991). "Cognitive addition: Strategy choice and speed-of-processing differences in young and elderly adults". Psychology and Aging. 6 (3): 474–483. doi:10.1037/0882-7974.6.3.474. ISSN1939-1498.
Oxford, Jonathan; Ponzi, Davidé; Geary, David C. (2010). "Hormonal responses differ when playing violent video games against an ingroup and outgroup". Evolution and Human Behavior. 31 (3): 201–209. doi:10.1016/j.evolhumbehav.2009.07.002. ISSN1090-5138.
Geary, David C.; Wiley, Judith G. (1991). "Cognitive addition: Strategy choice and speed-of-processing differences in young and elderly adults". Psychology and Aging. 6 (3): 474–483. doi:10.1037/0882-7974.6.3.474. ISSN1939-1498.
Oxford, Jonathan; Ponzi, Davidé; Geary, David C. (2010). "Hormonal responses differ when playing violent video games against an ingroup and outgroup". Evolution and Human Behavior. 31 (3): 201–209. doi:10.1016/j.evolhumbehav.2009.07.002. ISSN1090-5138.