Lieberman, Philip (2000): Human language and our reptilian brain: the subcortical bases of speech, syntax, and thought. Perspectives in Biology and Medicine. Vol. 44. Cambridge, Massachusetts: Harvard University Press. doi:10.1353/pbm.2001.0011. ISBN 9780674002265. OCLC 43207451. PMID 11253303. S2CID 38780927; s. 32–51.
Lieberman, Philip (2000): Human language and our reptilian brain: the subcortical bases of speech, syntax, and thought. Perspectives in Biology and Medicine. Vol. 44. Cambridge, Massachusetts: Harvard University Press. doi:10.1353/pbm.2001.0011. ISBN 9780674002265. OCLC 43207451. PMID 11253303. S2CID 38780927; s. 32–51.
Lieberman, Philip (2000): Human language and our reptilian brain: the subcortical bases of speech, syntax, and thought. Perspectives in Biology and Medicine. Vol. 44. Cambridge, Massachusetts: Harvard University Press. doi:10.1353/pbm.2001.0011. ISBN 9780674002265. OCLC 43207451. PMID 11253303. S2CID 38780927; s. 32–51.
Lieberman, Philip (2000): Human language and our reptilian brain: the subcortical bases of speech, syntax, and thought. Perspectives in Biology and Medicine. Vol. 44. Cambridge, Massachusetts: Harvard University Press. doi:10.1353/pbm.2001.0011. ISBN 9780674002265. OCLC 43207451. PMID 11253303. S2CID 38780927; s. 32–51.