Hegarty, M. (2005). A feature-based syntax of functional categories: The structure, acquisition, and specific impairment of functional systems. Mouton de Gruyter.

Hegarty, Michael. A Feature-based Syntax of Functional Categories: The Structure, Acquisition, and Specific Impairment of Functional Systems. Berlin ; New York: Mouton de Gruyter, 2005.

Hegarty, Michael. A Feature-based Syntax of Functional Categories: The Structure, Acquisition, and Specific Impairment of Functional Systems. Mouton de Gruyter, 2005.