Answer: External sources.
Explanation: human resource managers employ a wide range of sources to help in the process of gathering information and deciding who should be hired, to serve the best interests of the individual and that of the organization. Given this both internal (current employees who can be transferred/promoted/who can recommend to others to hire) and external (advertisements, employment agencies etc.) sources are employed. External sources in the sense that people or agencies outside, rather than the organisation are outsourced to obtain the right number of qualified people at the right time for the organisation.
