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                                GOST
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                            Akopyan A. Earliest States of Eastern Europe. 2015: Economic systems of Eurasia in the Early Middle Ages // Russian archeology.  – 2018. – Issue 3 C. 177-182 . URL: https://rosarchras.ru/s086960630004270-6-1/?version_id=7957. DOI: 10.7868/S0004270-6-1  | 
                        
                                                                    
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                                MLA
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                            Akopyan, Alexander V "Earliest States of Eastern Europe. 2015: Economic systems of Eurasia in the Early Middle Ages." Russian archeology.  3 (2018).:177-182. DOI: 10.7868/S0004270-6-1  | 
                        
                                                                    
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                                APA
                             | 
                            Akopyan A. (2018). Earliest States of Eastern Europe. 2015: Economic systems of Eurasia in the Early Middle Ages.  Russian archeology.  no. 3, pp.177-182 DOI: 10.7868/S0004270-6-1  |