Roberts, Charlotte A.; Pfister, Luz-Andrea; Mays, Simon (1 July 2009). "Letter to the editor: Was tuberculosis present in Homo erectus in Turkey?". American Journal of Physical Anthropology. 139 (3): 442–444. doi:10.1002/ajpa.21056. ISSN1096-8644. PMID19358292.
Fogel, R. W. (2004). "Technophysio evolution and the measurement of economic growth". Journal of Evolutionary Economics. 14 (2): 217–21. doi:10.1007/s00191-004-0188-x. S2CID154777833.
Roberts, Charlotte A.; Pfister, Luz-Andrea; Mays, Simon (1 July 2009). "Letter to the editor: Was tuberculosis present in Homo erectus in Turkey?". American Journal of Physical Anthropology. 139 (3): 442–444. doi:10.1002/ajpa.21056. ISSN1096-8644. PMID19358292.
Fogel, R. W. (2004). "Technophysio evolution and the measurement of economic growth". Journal of Evolutionary Economics. 14 (2): 217–21. doi:10.1007/s00191-004-0188-x. S2CID154777833.
Roberts, Charlotte A.; Pfister, Luz-Andrea; Mays, Simon (1 July 2009). "Letter to the editor: Was tuberculosis present in Homo erectus in Turkey?". American Journal of Physical Anthropology. 139 (3): 442–444. doi:10.1002/ajpa.21056. ISSN1096-8644. PMID19358292.