Electrum from selected localities.
Bulgaria | |
| Bogdanov, K., Tsonev, D., and Kuzmanov, K. (1997): Mineralium Deposita 32, 219-229. |
| Bogdanov, K., Tsonev, D., & Popov, K. (2004). Mineral Assemblages And Genesis Of The Cu-Au Epithermal Deposits In The Southern Part Of The Panaguyrishte Ore District, Bulgaria. Bulletin of the Geological Society of Greece, 36:406-415 |
| Singer, D.A., Berger, V.I., and Moring, B.C. (2008): US Geological Survey Open-File Report 2008-1155. |