1. Statistical annual book (2018/2019);Minist Environ Water Agric Riyadh, KSA,2018
2. General authority of metrological and environmental protection;Annual report, KSA.,2018
3. Annual report,2015
4. General autouratity of statistic, statistical book, Riyadh, KSA,2020
5. Databank home: world development indicators, database,2020