Refer to company/institution websites: Visit the careers, employment, or Human Resources areas of the site.
Contact temporary employment and staffing agencies
Refer to LinkedIn company/institution pages
Refer to company/institution social media sites
Find "niche" job posting boards (i.e. www.dice.com for technology jobs)
Search company/institution on Google
Network! Connect with your existing contacts. Ask friends, family, classmates and instructors if they know someone in your field.