1. Anon., 1491, Hortus Sanitatis,De lapidibus et in terre venis nascentibus: Jacob Meydenbach Mainz, (haematite is chapter 51, author not known with any certainty).
2. Bateman, A. M., 1959,Economic Mineral Deposits, 2nd edn: John Wiley & Sons Inc.
3. Bauschio, J. L., 1665,De lapide haematite et schisto schediasma, AN Cur, Lipsiae (Leipsig).
4. Beckmann, J., 1799,Marbodi liber lapidum seu de gemmis[Marbod’s book of stones and on gems]: J. C. Dieterich, Gottingen.
5. Blanchard, R., 1968, Interpretation of leached outcrops:Bulletin 66, University of Nevada.