Elena Takmakova Earnings of the Population as an Economic Category and an Indicator of the Economy’s Development // Russian Journal of Entrepreneurship. — 2010. — № 7-2 (163). — p. 9-13. — URL: http://bgscience.ru/com/lib/2342
Olyga Kaurova, Aleksandr Maloletko Shadow Costs of Hotels and Similar Accommodation Facilities // Russian Journal of Entrepreneurship. — 2010. — № 3-2 (155). — p. 154-161. — URL: http://bgscience.ru/com/lib/2183