Professional Book Publishers. (2019). Air (Prevention and Control of Pollution) Act 1981. Professional Book Publishers.
Chicago-referens (17:e uppl.)Professional Book Publishers. Air (Prevention and Control of Pollution) Act 1981. Delhi: Professional Book Publishers, 2019.
MLA-referens (9:e uppl.)Professional Book Publishers. Air (Prevention and Control of Pollution) Act 1981. Professional Book Publishers, 2019.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.