Multiple works by same author in same year
Important: Confirm with your lecturer whether you are using APA 6th or APA 7th as they are slightly different.
When an author has published more than one cited article in the same year, distinguish each article by using a lower case letter after the year within the brackets (this is also written in the reference list).
In a study by Crowley (2011a), it was found that . . .
It is suggested that . . . (Crowley, 2011b).