1. Russell B (1967) History of western philosophy, Routledge (reedit up to 1995). ISBN 0-415-07854-7.A
2. Partington JR (1970) A history of chemistry. Macmillan, London
3. Habashi F (2000) Zoroaster and the theory of four elements. Bull Hist Chem 25:109–116
4. Ball P (2004) The elements: a very short introduction. OUP Oxford, p 33. ISBN 9780191578250
5. Šesták J (2004) Heat, thermal analysis and society. Nucleus, Hradec Králové