The other elements in the receipt serve to lend clarity to the transaction.
Opt for the mode of payment, cash, check, money order, or any other. If payment is by check or money order, make sure to specify the number and date of the instrument in the receipt.
Sign the receipt, and include the place and date of signature. Witnesses are optional, and usually included when the amount or the magnitude of the work is high.
Another option, not included in the sample receipt for services is to include a reference number. This has no relevance to the person who receives the receipt, but allows you, or the person issuing the receipt to keep track of receipts and payments. One good way to do so is to index the reference number by date, as 2011:1, 2011:2, and so on. If dealing with regular clients, assign a code number for each client, and group the serial number client wise, such as 1/2011:1, 1/2011:2, 2:2011:1, and so on.
This is a generic receipt, and can be customizable as required. If you are looking for free cash receipt template instead, follow this link.