Bickerton, Derek. 1981. Roots of language. Ann Arbor: Karoma Publishers [Republished in 2016 by Language Science Press: https://langsci-press.org/catalog/book/91].
@book{bickerton_roots_1981,
address = {Ann Arbor},
author = {Bickerton, Derek},
publisher = {Karoma Publishers [Republished in 2016 by Language Science Press: https://langsci-press.org/catalog/book/91]},
title = {Roots of language},
url = {https://langsci-press.org/catalog/book/91},
year = {1981},
isbn = {978-0-89720-044-8},
language = {English}
}