NFW.org?Lưu trữ 2009-12-15 tại Wayback Machine, Is the octopus really the invertebrate intellect of the sea, by Doug Stewart. In: National Wildlife. Feb/Mar 1997, vol.35 no.2.
NFW.org?Lưu trữ 2009-12-15 tại Wayback Machine, Is the octopus really the invertebrate intellect of the sea, by Doug Stewart. In: National Wildlife. Feb/Mar 1997, vol.35 no.2.