Referencing text within a formula to locate the data used within that formula

Hi,

I was wondering whether there was a way that I could do the following:

Assume I have data separated into worksheets by calendar month, i.e. worksheet 1 is January, worksheet 2 is February etc. The format of these worksheets are all the same.

If on worksheet three, I wanted to use any of the data, I would usually reference the actual worksheet, for example FORMULA('January!'D2) etc however if I wanted to change the figures from the January data to the February data, I would have to manually adjust all the formula's that reference these sheets.

Is there a way I could have a cell, eg A1, that I manually type in January, February etc and then the formula's use the inputted data in cell A1 as a location reference to the relevant worksheet?

A simple example would be (which isn't a working formula before anyone moans): =SUM(A1'B2+H3)

A1 being January in this instance
B2 is from the January worksheet
H3 is from the current worksheet (Worksheet 3).

So the formula is asking to add B2 from January worksheet (which is referenced by A1) with H3 from worksheet 3.

If I were to then change cell A1 to February, the formula would automatically update and use the figures from February worksheet rather than January.

Is this possible?

Thanks,