Stiles, C.W. & Nolan, M.O., 1931. Key catalogue of parasites reported for Chiroptera (bats) with their possible public health importance. National Institute of Health Bulletin, No.155: 603-789., p.479.

Salmon, H.M., 1931. The Manx shearwater?s flea. British Birds 25(6): 171-172., p.407.

Middleton, A.D., 1931. The grey squirrel. London, p.68., p.295.

Boyd, A.W., 1931. Notes on the tree sparrow. British Birds 25(10): 278-285., p.35.

Britten, H., 1931. Additions to the insect fauna of Lancashire and Cheshire for the years 1929-30. 17th Report of the Lancashire and Cheshire Fauna Committee (1930): 15-21., p.46.

Lethbridge, T.C., 1931. Recent excavations in Anglo Saxon cemeteries in Cambridgeshire and Suffolk.  Cambridge Antiquarian Society. Quarto Publications. New Series, No. III: 1-90 (p.39)., p.263.

, & Gardner, A.D., 1931. The health and parasites of a wild mouse population. Proceedings of the Zoological Society of London (1931): 657-721., p.131.

Patton, W.S., 1931. Insects, ticks, mites and venomous animals of Medical and Veterinary Importance (Part II Public Health). H. R. Grubb Ltd, Croydon., p.339.