Hi,
You have at least one circular reference in Y2 on Sheet 2. This formula () is of course referencing itself hence the circular argument. All similar formulae are of course the same.
As a general point I suspect you really need to reconsider your whole layout so that you have a 'normalised' 2 dimensional table that could be used by a Pivot table, or indeed any other functions.
So consider a single sheet database where you have columns for
Date
Book types (currently column A) (you could set up a drop down data validation list)
Staff Type - i.e. populated with 1 or 2 (from data validation list)
FT Type i.e. populated with "FT", "Local FT", "NFT" and presumaby "bibs" (from data validation list
Numbers
Without knowing your process and overall intention it's a little difficult to comment further
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