Zhelyazkova, G., Zhelyazkova, Slaveya Gencheva Towards Viability and Sustainability of the Tourism in Bulgaria,
Batumi State Maritime Academy, 2016, pp. 175 - 185, ISBN 978-9941-0-9114-8.
Zhelyazkova, G., Zhelyazkova, Slaveya Gencheva .
Towards Viability and Sustainability of the Tourism in Bulgaria.
Batumi: Batumi State Maritime Academy, 2016, pp. 175 - 185, ISBN 978-9941-0-9114-8.
Zhelyazkova, G., Zhelyazkova, Slaveya Gencheva (2016)
Towards Viability and Sustainability of the Tourism in Bulgaria,
Batumi: Batumi State Maritime Academy, pp. 175 - 185, ISBN 978-9941-0-9114-8
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