Final answer:
The document used to assign direct labor to each job is known as a time ticket, which helps in allocating labor costs to specific jobs for companies using job order costing.
Step-by-step explanation:
The source document used to assign direct labor to each particular job is known as a time ticket. A time ticket is a document that records the amount of time an employee spends on a job.
It's used by companies that engage in job order costing to allocate labor cost to the specific jobs or to specific clients. The information from the time tickets is then transferred to a job cost sheet, which accumulates all costs related to a particular job.