"Formalizing Functionalism". Carnie, Harley and Willie (eds). Formal Approaches to Function. Philadelphia: John Benjamins. 1-10.
Carnie, Andrew and Heidi Harley (2003) "Formalizing Functionalism". Carnie, Harley and Willie (eds). Formal Approaches to Function. Philadelphia: John Benjamins. 1-10.