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That's an annoying construction to punctuate, I agree. You might try: Smith and Johnson's article (2013) investigated blah blah The article from Smith and Johnson (2013) investigated blah ...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/25449 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/25449 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
That's an annoying construction to punctuate, I agree. You might try: > Smith and Johnson's article (2013) investigated blah blah > > The article from Smith and Johnson (2013) investigated blah blah > > The paper from Johnson et al. (2013) investigated blah blah Please note the space between _al._ and _2013._ The _al._ is short for _alia,_ meaning "others." In any case, I wouldn't put the apostrophe-S after the year in parens. It looks too weird. Reword until you get the year and possessive apart.