Culture in Whales and Dolphins
Rendell, Luke and Hal Whitehead
Behaioral and Brain Science
(Volume and page number not listed)

Cultural Transmission of tool use in bottlenose dolphins
Michael Kruzen, Janet mann, Michael R. Heithaus, Richard C. Connor, Lars Bejder and William B. Sherwin
PNAS  2005; 102;8939-8943. Publihsed online jun 9 2006

Cortical Complexity in Cetacean Brains
Marino, Lori, Patrick R. Hof, Rebecca Chanis
The Anatomical Record Part A: Discoveries in Molecular, Cellular and Evolutionary biology
Volume 287A, Issue 1, November 2005
Pages 1142-1152

Dolphin Moms Teach Daughters to Use Tools
James Owen
National Geographic News
June 7, 2005

Animal Behaviour: Continuous Activity in Cetaceans after birth. Nature 435, 1177 (30 June 2005)
Lyamin, Oleg,  Julia Pryasolave, Valentine Lance and Jerome Siegel.