J. P.  Baumberger, ?A nutritional study of insects, with special reference to microorganisms and their substrata?, Journal of Experimental Zoology, vol. 28, pp. 1-81, 1919.

M. D.  Coffey, ?Studies on the association of flies (Diptera) with dung in southeastern Washington?, Annals of the entomological Society of America, vol. 59, pp. 207-218, 1966.

J. H.  Poorbaugh, Anderson, J. R., and Burger, J. F., ?The insect inhabitants of undisturbed cattle droppings in Northern California?, California vector views, vol. 15(3), pp. 17-36, 1968.