Reference for Berakhot 83:10
היו יושבין כל אחד מברך לעצמו הסבו אחד מברך לכולן
If men were sitting [at the meal], each one says Grace for himself. If they were reclining, one may say it for all.
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Talmud Bavli
היו יושבין כל אחד מברך לעצמו הסבו אחד מברך לכולן
If men were sitting [at the meal], each one says Grace for himself. If they were reclining, one may say it for all.