India. Department of Environment. Environmental Information System (ENVIS). (1984). Directory of non-governmental organisations in environment. Environmental Information System (ENVIS), Department of Environment, Government of India.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)India. Department of Environment. Environmental Information System (ENVIS). Directory of Non-governmental Organisations in Environment. New Delhi: Environmental Information System (ENVIS), Department of Environment, Government of India, 1984.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)India. Department of Environment. Environmental Information System (ENVIS). Directory of Non-governmental Organisations in Environment. Environmental Information System (ENVIS), Department of Environment, Government of India, 1984.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.