Não informado. (2018). Annual Report. Her Majesty's Stationery Office, Department of the Environment.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Annual Report. London: Her Majesty's Stationery Office, Department of the Environment, 2018.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Annual Report. Her Majesty's Stationery Office, Department of the Environment, 2018.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.