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1990. The Old English impersonals revived. In Sylvia M. Adamson , Vivien A. Law , Nigel Vincent & Susan Wright (eds.), Papers from the 5th International Conference on English Historical Linguistics (Current Issues in Linguistic Theory 65), 111–40. Amsterdam: John Benjamins.
Paul Hopper & Sandra Thompson . 1980. Transitivity and discourse. Language
Ruth Möhlig-Falke . 2012. The early English impersonal construction: An analysis of verbal and constructional meaning (Oxford Studies in the History of English). New York: Oxford University Press.