R. D.  Harkness and Isham, V., ?Relations between nests of Messor wasmanni in Greece?, Insectes Sociaux, vol. 35, no. 1, pp. 1-18, 1988.

M. L. R.  Harkness and Harkness, R. D., ?An odd activity of an ant (Cataglyphis bicolor); "visiting"?, Insectes Sociaux, vol. 38, no. 1, pp. 45-49, 1991.

R. D.  Harkness and Maroudas, N. G., ?Central place foraging by an ant (Cataglyphis bicolor Fab.): a model of searching.?, Animal Behaviour, vol. 33, no. 3, pp. 916-928, 1985.