Não informado. (2018). Annual Report. Her Majesty's Stationery Office, Department of the Environment.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Annual Report. London: Her Majesty's Stationery Office, Department of the Environment, 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Annual Report. Her Majesty's Stationery Office, Department of the Environment, 2018.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.