1. Ministry of Health Directorate General of Health Centres Manual of Primary Health Care 1986 Riyadh Saudi Arabia.
2. Ministry of Health Riyadh Regional Health Affairs Annual Report for the year 1989 Saudi Arabia.
3. Immunization coverage survey in eight regions of Saudi Arabia;Al-Shehri SN;Ann Trop Paediatr,1991
4. Ministry of Finance and National Planning Central Department of Statistics-General Population Census for the year 1974 Riyadh Saudi Arabia.
5. King Saud University College of Arts Department of Geography (1981)–National Population Atlas of Kingdom of Saudi Arabia Page 19 Riyadh.