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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रV, Khanova Yelena, और Skibina Svitlana O. Sustainable Development of EU Countries: Assessment Methodology and Indicators. PH "INZHEK", 2017.
एमएलए (9वां संस्करण) प्रशस्ति पत्रV, Khanova Yelena, और Skibina Svitlana O. Sustainable Development of EU Countries: Assessment Methodology and Indicators. PH "INZHEK", 2017.
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