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* A translation may be found [http://neo-classical-physics.info/uploads/3/0/6/5/3065888/caratheodory_-_thermodynamics.pdf here]. A mostly reliable translation is to be found at Kestin, J. (1976). The Second Law of Thermodynamics, Dowden, Hutchinson & Ross, Stroudsburg PA.
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*Marsland, R. , Brown, H.R., Valente, G. (2015). [https://aapt.scitation.org/doi/abs/10.1119/1.4914528 Time and irreversibility in axiomatic thermodynamics], Am. J. Phys., 83(7): 628–634.
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*Tisza, L. (1966). Generalized Thermodynamics, M.I.T. Press, Cambridge MA.
*Zemanksy, M.W., Dittman, R.H. (1937/1981). Heat and Thermodynamics. An Intermediate Textbook, sixth edition, McGraw-Hill Book Company, New York, ISNM 0-07-072808-9.