1. Homo erectus and Homo sapiens: one or more species?;Aguirre;Cour. Forsch. Inst. Senckenberg,1994
2. Natural history of Homo erectus;Antón;Ybk. Phys. Anthropol.,2003
3. Interobserver error involved in independent attempts to measure cusp areas of Pan M1s;Bailey;J. Anat.,2004
4. Human Evolution;Bilsborough,1992
5. Cranial morphometry of early hominids: facial region;Bilsborough;Am J. Phys. Anthropol.,1988