The sentence is it is based on Grice (1975), Sperber & Wilson (1986/1995/2008), Levinson (2000) and Costa (2009)’s inferential studies. Do I add apostrophe s to all of them (Grice's (1975),... Costa's (2009) inferential studies? Or do I add it on the last author only? And if so, is it before (Costa's (2009)) or after (Costa (2009)'s ) the reference?
How do I use possessive when there is more than one author as a reference in a text?
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