1. Fryer, G. & Iles, T. D. The Cichlid Fishes of the Great Lakes of Africa. Their Biology and Evolution(Oliver & Boyd, Edinburgh, 1972).
2. Regan, C. T. Proc. zool. Soc. Lond. 1922, 157–191 (1922).
3. Sage, R. D., Loiselle, P. V., Basasibwaki, P. & Wilson, A. C. in Evolution of Fish Species Flocks (eds Echelle, A. A. & Kornfield, I.) 185–201 (University of Maine Press, Orono, 1984).
4. Greenwood, P. H. Bull. Br. Mus. nat. Hist. (Zool.) 44, 249–290 (1983).
5. Greenwood, P. H. Bull. Br. Mus. nat. Hist. (Zool.) 45, 209–231 (1983).