Which of the following is not a source of external recruitment?

1. Campus recruitment
2. Casual callers
3. Web publishing
4. Promotion

Option 1 -> Campus recruitment involves hiring from educational institutions, bringing in candidates from outside the organization, making it an external recruitment source.

Option 2 -> Casual callers are job seekers who approach the company directly without formal invitation, representing an external recruitment source.

Option 3 -> Web publishing refers to advertising job vacancies on websites, job portals, or social media to attract external candidates, making it an external recruitment source.

Option 4 -> Promotion involves filling vacancies by elevating existing employees to higher positions within the organization, making it an internal recruitment source, not external.

Hence, Option 4: Promotion -> Promotion is an internal recruitment method where current employees are moved to higher positions within the organization, rather than sourcing candidates from outside the company -> correct