p79.
See Alasdair MacIntyre (1981), After Virtue, especially chapter 14; a definition of “practice” is on p 187. “The hedgehog and the fox” refers to a fragment of poetry surviving from Archilocus (680–645 BC); the idea is discussed at length in Isaiah Berlin (1953), The Hedgehog and the Fox: An Essay on Tolstoy’s View of History.