Thompson, G.J., Kitade, O., Lo, N., and Crozier, R.H. (2004) On the origin of termite workers: weighing up the phylogenetic evidence. Journal of Evolutionary Biology, 17 (1). pp. 217-220.

Thompson, G.J., Kitade, O., Lo, N., and Crozier, R.H. (2000) Phylogenetic evidence for a single, ancestral origin of a ‘true’ worker caste in termites. Journal of Evolutionary Biology, 13 (6). pp. 869-881.