1. The world Sulphur shortage;A.C;The World Today,1951
2. BP. (2019)BP Energy Outlook 2019 edition The Energy Outlook explores the forces shaping the global energy transition out to 2040 and the key uncertainties surrounding that.BP Energy Outlook 2019 22–24 72–76 144–118.
3. BP. (2020)Energy Outlook Fuels Gas. Available from:https://www.bp.com/en/global/corporate/energy‐economics/energy‐outlook/demand‐by‐fuel/natural‐gas.html. Accessed August 2022.
4. BP. (2021)Statistical Review of World Energy 2021 70th editionAvailable from:https://www.bp.com/en/global/corporate/energy‐economics/statistical‐review‐of‐world‐energy.html. Accessed August 2022.
5. BP. (2022)BP Energy Outlook 2022 editionAvailable from:https://www.bp.com/content/dam/bp/business‐sites/en/global/corporate/pdfs/energy‐economics/energy‐outlook/bp‐energy‐outlook‐2022.pdf. Accessed August 2022.