Ghi chú Ngôn_ngữ_tự_nhiên

  1. ↑ Lyons, John (1991). Natural Language and Universal Grammar. New York: Cambridge University Press. tr. 68–70. ISBN 978-0521246965. 
  2. ↑ Fernandes, Keith (2008). On the Significance of Speech: How Infants Discover Symbols and Structure. Ann Arbor, MI: ProQuest. tr. 7–8. ISBN 978-1243524065.