Ultimately I am wanting to create a custom field called PO Received Month which pulls the month of the PO Received Date field, but in text format, not number format.

Currently this is the formula I put in the Formula Text field but its spitting out "4" for April and "5" for May and I want it to read "April" and "May".

TEXT(( YEAR( PO_Received_Date__c )))

 Thanks in advance!