Gerhard Roth und Ursula Dicke (2005-05). „Evolution of the brain and Intelligence”. TRENDS in Cognitive Sciences. 9 (5): 250–7. doi:10.1016/j.tics.2005.03.005. PMID15866152.Verificați datele pentru: |date= (ajutor); |access-date= necesită |url= (ajutor)
Shoshani, Jeheskel; Kupsky, William J.; Marchant, Gary H. (). „Elephant brain Part I: Gross morphology, functions,comparative anatomy, and evolution”. Brain Research Bulletin. 70 (2): 124–157. doi:10.1016/j.brainresbull.2006.03.016. PMID16782503.
Gerhard Roth und Ursula Dicke (2005-05). „Evolution of the brain and Intelligence”. TRENDS in Cognitive Sciences. 9 (5): 250–7. doi:10.1016/j.tics.2005.03.005. PMID15866152.Verificați datele pentru: |date= (ajutor); |access-date= necesită |url= (ajutor)
Shoshani, Jeheskel; Kupsky, William J.; Marchant, Gary H. (). „Elephant brain Part I: Gross morphology, functions,comparative anatomy, and evolution”. Brain Research Bulletin. 70 (2): 124–157. doi:10.1016/j.brainresbull.2006.03.016. PMID16782503.