Is it correct to say that purchases book is a record prepared from the invoices received from suppliers?
Yes, as the source documents for recording entries in the purchases book are invoices or bills received from the suppliers of goods.
Is it correct to say that sales book is a record prepared from invoices issued to customers?
Is it correct that the total of the purchase invoices recorded in the purchases book is posted to the debit side of the purchases account in the ledger and credited to the accounts of suppliers?