(a) Source Document - It is an original document evidencing a business transaction. It forms the basis of entries in the books of accounts and provides basic details about a transaction
(b) Types of Source Documents
i. Cash receipts
ii. Sales invoices
iii. Purchase invoices
iv. Petty cash vouchers
v. Stores vouchers
vi. Bank pay-in-slips
vii. Cheque stubs/counterfoils
viii. Credit notes
ix. Debit notes
x. Bank statements
(c) Uses of Subsidiary Books.
i. They are used as the primary record of transactions since they are the first to be written directly from the source documents.
ii. To provide greater details about transactions than ledgers will do.
iii. As a backup for entries made into the ledger.
iv. As means of classifying data obtained from business documents.