Dictionary of Human Resources and Personnel Management - Along with brief definitions, this online reference book contains templates for a job description, application, invitation to interview, letter of reference, letter of appointment, short contract, and personnel record form.
Encyclopedia of Management
Staffing Forecasting and Planning by 
From We Will to at Will: A Handbook for Veteran Hiring, Transitioning, and Thriving in the Workplace by eBook Collections (EBSCO) is a large collection of e-books on a variety of subjects, including staffing. Here is one example. Click on the title to launch the ebook.
U.S. Office of Personnel Management (OPM) - The OPM provides human resources support to federal agencies. This particular section of OPM.gov focuses on job analysis, a critical early component to the process of recruitment and selection. It includes a training presentation and a checklist on how best to conduct a job analysis.
This brief video [3:11] discusses job design and establishing staffing needs.
