confuse about source of document

i wanted to try to explain these for you but how can you not know these and you are doing f8.
this is the first things you learn in bookkeeping. i want to help but i think you need to go back to you f3 notes first to revise accounting and accounting documents.

anyway if i understand you question properly, source document means the original document, in other words the document where the information originated.e.g source document for a sale recorded is the sales invoice.
Payable ledger is the ledger/book where the purchases transaction are recorded, so a list of payable balances is a list of all creditors recorded in the payable ledger and their account balances.
sale ledger is the ledger where all the sale transaction to customers are records therefore a list of sales ledger balances is the list of all debtors in the sale ledger and their balances.
General ledger is the ledger where general items are recorded. any other transaction that are not sale to customers or purchase from suppliers will be recorded in the general ledger. e.g Assets, control accounts etc.

I do not mind to help anytime as long as you take advice.
please go through the basic of account are recording transaction.