Below are 10 documents typically examined during an audit. Classify each document as either internal or external.

1. Accounts receivable subsidiary ledger

2. Authorization form to withhold voluntary United Way contributions

3. Purchase Order

4. Articles of Incorporation

5. Bank Statements

6. Minutes of board meetings

7. Signed lease agreements (assume you are "making a purchase" through a lease)

8. Payroll register

9. Sales Invoice (assume you are the "seller")

10. Cancelled checks