van Driem, G. (2005) The language organism: the Leiden theory of language evolution. In James W. Minett and William S.-Y. Wang, editors, Language Acquisition, Change and Emergence: Essays in Evolutionary Linguistics . City University of Hong Kong Press.

van Driem, G. (2005) The language organism: the Leiden theory of language evolution. In James W. Minett and William S.-Y. Wang, editors, Language Acquisition, Change and Emergence: Essays in Evolutionary Linguistics. City University of Hong Kong Press.

2007