Clayton, C.J. (1986). The chemical environment of flint formation in Upper Cretaceous chalks. In: The Scientific Study of Flint and Chert (ed. by G. de G. Sieveking and B. Hart), pp. 43-45. Cambridge University Press, Cambridge.
Clayton, N.S. and Krebs, J.R. (1994) One-trial associative memory: comparison of food-storing and nonstoring species of birds. Animal Learning & Behavior 22(4):366-372.
Clayton, N.S. and Krebs, J.R. (1995) Memory in food-storing birds: from behaviour to brain Current Opinion in Neurobiology Volume 5(2):149-154
Clayton, N.S. (1999) Scrub jays (Aphelocoma coerulescens) remember the relative time of caching as well as the location and content of their caches Journal of Comparative Psychology Volume 113(4):403-416
Clayton, N.S.& Dickinson, A. (1999) Motivational control of caching behaviour in the scrub jay, Aphelocoma coerulescens. Animal Behaviour Volume 57(2):435-444
Clayton, N.S., Griffiths, D.P., Emery, N.J. & Dickinson, A. (2001) Elements of episodic-like memory in animals Philosophical Transactions Royal Soc. London B356:1483-1491
Clayton, N.S., Bussey, T.J & Dickinson, A. (2003) Can animals recall the past and plan for the future? Nature Reviews Neuroscience 4(:685-91