Leslie Lum's Introduction to Business: Readings and Workbook: "Module 5: Management, Leadership and Employees"
Re-read pages 253–256 about recruitment and retaining to get a sense of the depth of information an HR person has to have just in the process of hiring and training new employees.
Click https://s3.amazonaws.com/saylordotorg-resources/wwwresources/site/wp-content/uploads/2012/05/Bus101-Book-May2011.pdf link to open resource.