Currently, I have a cell referencing a table on another sheet like so:

=VLOOKUP(A5,'Sheet2'!$J$4:$J$1998,1,TRUE)

But what I want to do is instead of referencing the sheet explicitly (i.e.
Sheet2), I'd like to reference a sheet based on another cell's value. E.g.:

=VLOOKUP(A5,'A2'!$J$4:$J$1998,1,TRUE)
where A2 would have the value "Sheet2".

Is this possible within excel?

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Thanks!
Max