- Dik, Simon (1986). On the notion “functional explanation”. Belgian Journal of Linguistics 1, Pp. 11–52.
- Du Bois, John (1985). "Competing motivations", in John Haiman (ed.), Iconicity in Syntax. Proceedings of a symposium on iconicity in syntax. Amsterdam and Philadelphia: Benjamins, Pp. 343–65.
- Haiman, John (1983). Iconic and economic motivation.
Language 59, Pp.781-819.
[pdf]
- Heine, Bernd and Tania Kuteva (2006). The Changing Languages of Europe. Oxford: Oxford University Press.
- MacWhinney, B., Malchukov, A. L., & Moravcsik, E. (2014) Competing motivations in grammar and usage. Oxford: Oxford University Press.
