Erickson, F. (1984).
School literacy, reasoning, and civility: An anthropologist's perspective. Review of Educational Research, 54(4), 525-546.

To call these capabilities practices is to say that an individual's ability to think is dialogically defined, that is, constituted by (a) other people in particular forms of social relationship, (b) the physical objects (utensils, tools) and symbols (words, numbers) with which the individual interacts, directly or vicariously, in doing the thinking (p. 529).