1. Ahrendts, J. (1977). The exergy of chemically reacting systems. Dusseldorf.
2. Ahrendts, J. (1980). Reference states. Energy, 5, 667–677.
3. Bosjankovic, F. (1963). Reference level of exergy of chemically reacting systems. Forschung Im Ingenieurwesen, 21, 151–152.
4. Botero, E. (2000). Valoración exergética de recursos naturales, minerales, agua y combustibles fósiles. Ph.D. thesis, Universidad de Zaragoza.
5. BP. (2019). British petroleum. Statistical Review of World Energy. Available at: https://www.bp.com/content/dam/bp/business-sites/en/global/corporate/pdfs/energy-economics/statistical-review/bp-stats-review-2019-full-report.pdf.