1. Some zoological concepts applied to problems in evolution of the hominid lineage;Brown;American Scientist,1958
2. New concepts in physical anthropology;Campbell;Annual Review of Anthropology,1973
3. Coon, C.S., 1962. The Origin of Races. Knopf, New York, 742pp.
4. Man's immediate forerunners;Curtis;Philosophical Transactions of the Royal Society of London (Series B),1981
5. What is Pithecanthropus dubius Koenigswald, 1950?;Franzen,1985