@techreport{british2021statistical,
  title = {Statistical Review of World Energy 2021}
  author = {British Petroleum, },
  url = {Retrieved from https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/statistical-review/bp-stats-review-2021-full-report.pdf},
  year = {2021}
}