., Financing and Place of the Bulgarian Army in Operations of International Crisis management, Land Forces Academy Magazine, NR. 3 (75), Sibiu, Romania, Nicolae Balcescu Land Forces Academy, 2014,pp. 307 ÷ 312.
 The World Bank Group, ForeignDirectInvestment - Net Inflows, International Monetary Fund, Balance of Payments Database, supplemented by data from the United Nations Conference on Trade and Development and Official National Sources, 2017, http://data.worldbank.org/indicator
 Varbanova, B., Risks of Reduction of Currency Board in