Jakobson R. (1962) Why 'mama' and 'papa'? // Jakobson, R. Selected Writings, Vol. I: Phonological Studies, Pp. 538–545. The Hague: Mouton.
45
Friederici A.D. & Chomsky N. (2017). Language in our brain: The origins of a uniquely human capacity. Language in Our Brain: The Origins of a Uniquely Human Capacity (pp. 1—284). The MIT Press.