1. Carnot, N. L. S. (1824). Réflexions sur la puissance motrice du feu et sur les machines propres à développer cette puissance. 43 pages, 2nd edition in French: Annales scientifiques de l’École Normale Supérieure Sér. 2, 1, 1872, pp. 393–457. This booklet is subject to ASME Landmark #676 of Mechanical Engineering.
2. Grassmann, P. (1961). Physikalische Grundlagen der Chemie-ingenieur-Technik. Edition Sauerländer Aarau and Frankfurt am Main.
3. IAPWS. (2007). Revised Release on the IAPWS industrial formulation 1997 for the thermodynamic properties of water and steam (The revision only relates to the extension of region 5 to 50 MPa).
4. International Energy Agency (IEA). (2014). Energy efficiency indicators: fundamentals on statistics. 387 pages, online accessible.
5. International Energy Agency (IEA). (2016). Energy efficiency indicators, highlights. 154 pages, internet accessible.