The Geriatric Resource Nurse (GRN) certification is run by NICHE. If your hospital is a member of NICHE (see here to check), you can complete the GRN program for free. Check with your hospital's nurse educators for details.
Related Books and Articles
Geriatrics Models of Care
by
Michael L. Malone (Editor); Marie Boltz (Editor); Jonny Macias Tejada (Editor); Heidi White (Editor)