Are you wondering why the letters "a" and "b" are appearing in citations for what should be the same source? Or do you want to know why the letters aren't appearing in alphabetical order? This video can help!
Miller 2016a and Miller 2016b are the same reference - why do I see the letters "a" and "b"?
Why does Miller 2016b appear before Miller 2016a?

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Length: 01 min 20 sec