| 2008 | - | Is a holistic protolanguage a plausible precursor to language? A test case for a modern evolutionary linguistics - Smith | :: | 1 |
| Smith, K. (2006). The protolanguage debate: bridging the gap? In A. Cangelosi, A. D. M. Smith, & K. Smith (Eds.), The evolution of language: Proceedings of the 6th international conference on the evolution of language (pp. 315-322). Singapore: World Scientific.
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| 2007 | - | The evolution of language - Kirby | :: | 1 |
| Smith, K. (2006). The protolanguage debate: bridging the gap? In Cangelosi, A., Smith, A., and Smith, K., editors, The Evolution of Language: Proceedings of the 6th International Conference on the Evolution of Language. World Scientic.
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