Explanation:

Some of the sources of recruitment are:

1. Promotion 2. Transfer 3. Retired or Ex-Employees 4. Job Posting

Some of the external sources of recruitment are:-

1. Advertising in Newspapers and Journals 2. Employment Exchanges 3. Internet (E-Recruitment) 4. Educational/Professional/Technical Institutions 5. Executive Search Firms 6. Union as a Source 7. Unsolicited or Walk-in Applicants 8. Direct Recruitment 9. Casual Callers 10. Campus Recruitment 11. Placement Agencies and Management Consultants 12. Recommendations of Employees 13. Labour Contractors 14. Web Publishing 15. Job Fairs 16. Personal Contacts 17. Poaching and Raiding 18. Service Commissions 19. Nepotism 20. Leasing 21. Data Banks.

Internal Sources of Recruitment:
Internal sources of recruitment are those where the vacancy is filled from within the organisation. It is desirable to look for applicants from within the organisation, if they have requisite qualifications needed to fill a vacancy. The internal sources of recruitment include personnel already on the payroll of an organisation. It also includes personnel who were once on the payroll and wish to return or whom the company may like to rehire.