Research
The ecology of the American grey squirrel (Sciurus carolinensis Gmelin) in the British Isles.
Middleton, A.D. 1930. In: Proceedings of the Zoological Society of London, 1930: 809-843. Zoological Society of London, London.
Cycles in the numbers of British Voles (Microtus).
Middleton, A.D. 1930. Journal of Ecology, 18: 156-165.