1. Ancient Egyptian gold refining
2. H. C. Hoover and L. H. Hoover: ‘Georgius AgricolaDe re metallicatranslated from the first Latin edition of 1556’, 399, footnote; 1912, London,The Mining Magazine(reprinted 1950, New York, Dover Publications).
3. ‘Diodorus Siculus’, Book III, Chap. 12–14, (trans. C. H. Oldfather), 115–123; 1935, Loeb Classical Library, London, Wm Heinemann.
4. The oldest metallurgical handbook
5. The Leyden Papyrus X. An English translation with brief notes