Health System Profile (PDF) (s. 8-9, 12,13) ISBN 978-92-75-33267-2. 2008. Health Policies and Systems Unit, Health Systems Strengthening Area (HSS/HP) of the Pan American Health Organization/World Health Organization (PAHO/WHO). Arkistoitu 4.2.2016. Viitattu 19.10.2012. (englanniksi)
Health System Profile (PDF) (s. 8-9, 12,13) ISBN 978-92-75-33267-2. 2008. Health Policies and Systems Unit, Health Systems Strengthening Area (HSS/HP) of the Pan American Health Organization/World Health Organization (PAHO/WHO). Arkistoitu 4.2.2016. Viitattu 19.10.2012. (englanniksi)