1. Altinli, I. E.: Explanatory text of the geological map of Turkey. Sheet Van, 1∶500,000 M.T.A., Publ., Ankara, 1964.
2. Benson, R. G.: The biodynamic effects of the Messinian salinity crisis. Palaeogeography, -climatology, -ecology,20, 1–170, 1976.
3. Blumenthal, M. M., van derKaaden, G. &Vlodavetz, V. I.: Catalogue of the active volcanoes of the world including solfatara fields. Part XVII Turkey and the Caucasus. Internat. Assoc. Volcanology, pp. 23, 1964.
4. British War Office Intelligence Division: Eastern Turkey in Asia. Sheet 19, Van-Bitlis. 1940 edition. First published in 1901. 1940.
5. Dansgaard, W., Johnson, S. J., Clauson, H. B., &Langway, C. C., Jr.: Climatic record revealed by the Camp Century ice core. In:Turekian, K. K. (ed.), The Late Cenozoic Glacial Ages, 37–56, Yale Univ. Press, New Haven and London, 1971.