The document discusses internal and external recruitment sources. Internal recruitment involves promoting from within an organization and has advantages like being less time-consuming and building employee loyalty. However, it risks vacant positions and dissatisfaction if some employees are passed over. External recruitment sources like job boards and agencies allow hiring new skills and minimizing costs but are more expensive and time-consuming. While internal candidates provide institutional knowledge, external hires are sometimes necessary to gain new perspectives and remain competitive in a changing business environment. Recruitment agencies can help source top external talent through their networks and research.