Crossword Genius

Citation abbr (4)

Ross

I think it could be either:

ibid

etal

(Other definitions for ibid that I've seen before include "'In the same place as previously mentioned, in short (4)'" , "In brief, notation meaning in came book or passage" , "(When citing a reference) in the same place (abbr)" , "(When citing a reference) in the same place (Latin)" , "(With written references) in the same place (Latin)" .)

I've seen this clue in The Chronicle of Higher Education, The Washington Post Sunday, the Ink Well xwords, The Washington Post, The Wall Street Journal, the LA Times, the New York Times, the Universal and the USA Today.
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