References :

Heritage, J. (2012).Epistemics in Action: Action Formation and Territories of Knowledge.Research on Language & Social Interaction, 45(1), 1--29.

Schegloff, E. A. (1984). On some questions and ambiguities in conversation.In JM. Atkinson and J. Heritage (Eds.), Structures of Social Action (pp. 28--52). Cambridge, England: Cambridge University Press.