[Question] Erving Goffman’s ‘paper’

I’ve never posted a question here, as to be honest, I’m a little intimidated. On page 128 of Schelling’s ‘Strategy of Conflict’, he refers to Erving Goffman. In the footnote, he refers to ‘Goffman’s paper’, but nothing more. Does anyone know the full reference, because it’s killing me that I can’t find it. Thank you very much in advance :)

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