"Ogosta Point". Australian Antarctic Data Centre Data management and spatial data services. Australian Government Department of Environment and Energy Antarctic Division. Retrieved 5 March 2017.
bas.bg
geology.bas.bg
Vasileva, Tanya; Gerginov, Peter; Orehova, Tatiana (May 31, 2008). "Groundwater and Human Pressure in the Ogosta River Basin"(PDF). Bulgarian Academy of Sciences Geological Institute. Geological Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria. Retrieved 5 March 2017.