| 2005 | - | Design and Performance of Pre-Grammatical Language Games - Van Looveren | :: | 1 |
| Crumpton, J. J. (1994). Evolution of two symbol signals by simulated organisms. Master's thesis, University of Tennessee, Knoxville.
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| 1999 | - | The Emergence of Communication through Synthetic Evolution - MacLennan | :: | 2 |
| [2] Joseph J. Crumpton. Evolution of two symbol signals by simulated organisms. Master's thesis, University of Tennessee, Knoxville, December 1994.
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| 1997 | - | Simulated Evolution of Language and Language Processors - Beaver | :: | 1 |
| [5] Joseph J. Crumpton. 1994. Evolution of Two Symbol Signals by Simulated Organisms, MS thesis.
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