Παραπομπή APA

WHO(world health organization). (2005). Healthy ageing: Practical pointers on keeping well. WHO.

Παραπομπή Chicago Style

WHO(world health organization). Healthy Ageing: Practical Pointers on Keeping Well. Geneva: WHO, 2005.

Παραπομπή MLA

WHO(world health organization). Healthy Ageing: Practical Pointers on Keeping Well. WHO, 2005.