1. Anon., representative from Muscat Municipality (February 2016).
2. Anon, representative from Ministry of Transport and Communication (February 2016)
3. Ministry of Transport and Communication, Sultanate of Oman, E-Annual Report 2017 (2017).
4. Muscat Municipality, Local Order No. 23/92, Building Regulations for Muscat, Sultanate of Oman (1992).
5. National Centre for Statistics and Information, Sultanate of Oman, Statistical Yearbook 2017 (2018).