Explain briefly 'casual callers' and 'labour contractors' as external sources of recruitment.
Casual callers : Many business organisation keep a database of unsolicited applicants, i.e. casual callers in their files. This source of recruitment is generally resorted to by manufacturing organisations to fill up vacancies at the labour level. It is an inexpensive method of recruitment.
Labour contractors: They supply the required workers to the organisations especially engaged in manufacturing. They keep a close contact with labourers. Through these contractors, workers are appointed in factories at a very short notice.