Valkov, A., Вълков, А., Penkova, E., Пенкова, Е. Market and Non-Market Alternatives in the Public-Financed Services Sector in Bulgaria : Discrepancies of Borders. Skopje: Institute of Knowledge Management, 2020 81-86,.
Valkov, A., Вълков, А., Penkova, E., Пенкова, Е. Market and Non-Market Alternatives in the Public-Financed Services Sector in Bulgaria : Discrepancies of Borders. Skopje: Institute of Knowledge Management, 2020 81-86,.
Valkov, A., Вълков, А., Penkova, E., Пенкова, Е. (2020) Market and Non-Market Alternatives in the Public-Financed Services Sector in Bulgaria : Discrepancies of Borders, Skopje: Institute of Knowledge Management 81-86,.
Valkov, A., Вълков, А., Penkova, E., & Пенкова, Е. (2020). Market and Non-Market Alternatives in the Public-Financed Services Sector in Bulgaria : Discrepancies of Borders. Knowledge - International Journal : Scientific Papers (с. 81-86). Skopje: Institute of Knowledge Management. 41 (1).
Valkov A, Вълков А, Penkova E, Пенкова Е. Market and Non-Market Alternatives in the Public-Financed Services Sector in Bulgaria : Discrepancies of Borders. Skopje: Institute of Knowledge Management; 2020. p. 81-86.