Rujukan Obsidian

  1. ↑ Peter Roger Stuart Moorey (1999). Ancient mesopotamian materials and industries: the archaeological evidence. Eisenbrauns. m/s. 108–. ISBN 978-1-57506-042-2. 
  2. ↑ Geological Survey (U.S.) (1981). Geological Survey (U.S.). The Survey. m/s. 185–. 
  3. ↑ John P. Rafferty (August 2011). Rocks. The Rosen Publishing Group. pp. 97–. ISBN 978-1-61530-492-9.
  4. ↑ I-science I' 2006 Ed. Rex Bookstore, Inc. pp. 127–. ISBN 978-971-23-4399-5.
  5. ↑ M E Malainey. A Consumer's Guide to Archaeological Science: Analytical Techniques, Springer, 2010 ISBN 1441957030
  6. ↑ Pan Ming Huang, Yuncong Li, Malcolm E. Sumner (editors) (2012). Handbook of Soil Sciences: Properties and Processes (Second Edition). Boca Raton: CRC Press. m/s. 20–24. ISBN 978-1-4398-0306-6. Selenggaraan CS1: Pelbagai nama: senarai pengarang (link) Selenggaraan CS1: Extra text: senarai pengarang (link)
  7. ↑ Brian Cotterell; Johan Kamminga (1992). Mechanics of pre-industrial technology: an introduction to the mechanics of ancient and traditional material culture. Cambridge University Press. m/s. 127–. ISBN 978-0-521-42871-2. Dicapai 9 September 2011.