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SAC...

Sacks, H. 1973. “Another Look at, Say, Some Grammatical Constraints on, Oh, Interjections and Hesitations”, in Papers from the Ninth Regional Meeting of the Chicago Linguistics Society, ed. C. Corum & T. C. Smith-Stark, pp. 316-328.

Sacks, H., Schegloff, E. A. & Jefferson, G. 1974. “A Simplest Systematic for the Organization of Turn-Taking for Conversation”. Language 50: 696-735.