@article{Berstein, author = {Berstein, Irvin S.}, title = {Age and Experience in Chimpanzee Nest Building}, series = {Psychological Reports (Southern Universities Press), (20, 1106, 1967).}, journal = {Psychological Reports (Southern Universities Press), (20, 1106, 1967).}, language = {en} } @article{Berstein, author = {Berstein, Irvin S.}, title = {Response to Nesting Materials of Wild Born and Captive Born Chimpanzees}, series = {Animal Behavior, Vol. 10 (No. 1-2), pp. 1-6.}, journal = {Animal Behavior, Vol. 10 (No. 1-2), pp. 1-6.}, language = {en} }