The following two citations were omitted from the references:

Dye, M., & Ramscar, M. (2009). No representation without taxation: the costs and benefits of learning to conceptualize the environment. In N.A. Taatgen & H. van Rijn (Eds.), Proceedings of the 31st Annual Conference of the Cognitive Science Society (pp. 3175–3180). Austin, TX: Cognitive Science Society.

Ramscar, M., Yarlett, D., Dye, M., Denny, K., & Thorpe, K. (2010). Feature-Label-Order effects and their implications for symbolic learning. Cognitive Science, 34(7).

The first citation appeared on page 13 of the article, line 27, and the second on page 26, line 40.