Stourton, E. Diary of a Dog Walker: Time Spent Following a Lead. (Doubleday, 2011).

Wells, М. J.&Young, J. Z. 'The effect of splitting part of the brain or removal of the median inferior frontal lobe on touch learning in octopus'. Journal of Experimental Biology, 50, 515–26 (1969); Wells, M. J.&Young, J. Z. The median inferior frontal lobe and touch learning in the octopus'. Journal of Experimental Biology, 56, 381–402(1972).