How to get value as header field in pivot table? - ms-access

Question

I've been looking for this answer for hours without finding anything at all on this subject.
I'm trying to get a pivot table from the "Sells" table that displays :
- as header fields, the name of each seller in my shop
- as rows, each month of the year
- as data the sum of their sells for each month
The only issue I have is that the headers are populated with ID instead of the name of the sellers.
For example, instead of showing this :
Month | Steve | Joe
January | 5000$ | 600$
February | 400$ | 400$
It keeps showing the ID related to each seller:
Month | 1 | 2
January | 5000$ | 600$
February | 400$ | 400$
Here is my query :
TRANSFORM Sum(Sells.Ca) AS [Monthly sells]
SELECT DISTINCTROW Format$(Sells.DateSold,'mm - mmmm') AS Month
FROM Sells
GROUP BY Sells.DateSold
PIVOT Sells.Seller
Thank you very much for your help and your time.
EDIT:
As #WolfgangKais mentionned in the comments, I forgot to mention that the Seller field is a lookup field, that's why it only shows the first value of the lookup field, hence the ID and not the name.

Answer 1

As stated by #June7 and #Wolfgang Kais, I had to include the Sellers Table in the query in order to get each seller's name instead of their ID, thank you very much for the lead.
This was done by :
Constructing a temporary table containing rows populated by sellers name, amount sold and date of sell:
SELECT Sellers.Name AS Seller, Sells.Ca AS Amount, Sells.DateSold AS Month
FROM Sells
INNER JOIN Sellers ON Sells.Seller = Sellers.ID
Including this temporary table into my first pivot query (In the FROM part):
TRANSFORM SUM(TempTable.Amount) AS [Monthly Sells]
SELECT Format$(TempTable.Month, 'mm - mmmm') AS Month
FROM(
SELECT Sellers.Name AS Seller, Sells.Ca AS Amount, Sells.DateSold AS Month
FROM Sells
INNER JOIN Sellers ON Sells.Seller = Sellers.ID
) AS TempTable
GROUP BY Temptable.Month
PIVOT Temptable.Seller