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*  A translation may be found [http://neo-classical-physics.info/uploads/3/0/6/5/3065888/caratheodory_-_thermodynamics.pdf here].  Also a mostly reliable [https://books.google.com/books?id=xwBRAAAAMAAJ&q=Investigation+into+the+foundations translation is to be found] at Kestin, J. (1976). The Second Law of Thermodynamics, Dowden, Hutchinson & Ross, Stroudsburg PA..
*Giles, R. (1964). Mathematical Foundations of Thermodynamics, Macmillan, New York.
*Guggenheim, E.A. (1949/1967). Thermodynamics. An Advanced Treatment for Chemists and Physicists, fifth revised edition, North-Holland, Amsterdam.
*Guggenheim, E.A. (1949). Statistical basis of thermodynamics, Research, 2: 450–454.
*Gyarmati, I. (1967/1970). Non-equilibrium Thermodynamics. Field Theory and Variational Principles, translated from the 1967 Hungarian by E. Gyarmati and W.F. Heinz, Springer-Verlag, New York.
*Haase, R. (1971). Survey of Fundamental Laws, chapter 1 of Thermodynamics, pages 1–97 of volume 1, ed. W. Jost, of Physical Chemistry. An Advanced Treatise, ed. H. Eyring, D. Henderson, W. Jost, Academic Press, New York, lcn 73–117081.
*Kelvin, Lord (1857). On the alteration of temperature accompanying changes of pressure in fluids, [https://archive.org/stream/mathematicaland03kelvgoog#page/n258/mode/2up Proc. Roy. Soc., June].
*Landsberg, P.T. (1961). Thermodynamics with Quantum Statistical Illustrations, Interscience, New York.
*Lieb, E.H., Yngvason, J. (1999). The physics and mathematics of the second law of thermodynamics, Physics Reports, 314: 1–96, p. 14.
*Planck, M. (1887). Ueber das Princip der Vermehrung der Entropie, Annalen der Physik und Chemie, new series 30: 562–582.
*Planck, M., (1897/1903). [https://archive.org/details/treatiseonthermo00planrich Treatise on Thermodynamics], translated by A. Ogg, Longmans, Green, & Co., London.
*Planck, M. (1935). Bemerkungen über Quantitätsparameter, Intenstitätsparameter und stabiles Gleichgewicht, Physica, 2: 1029–1032.
*Tisza, L. (1966). Generalized Thermodynamics, M.I.T Press, Cambridge MA.
*Uffink, J. (2001). Bluff your way in the second law of thermodynamics, Stud. Hist. Phil. Mod. Phys., 32(3): 305–394, publisher Elsevier Science.