Maftei, Mara Magda, Shivarov, Aleksandar Asenov Environmental Aspect of Sustainable Development,
Унив. изд. Наука и икономика, 2007, с. 34 - 39, 978-954-21-0283-0.
Maftei, Mara Magda, Shivarov, Aleksandar Asenov .
Environmental Aspect of Sustainable Development.
Варна: Унив. изд. Наука и икономика, 2007, с. 34 - 39, 978-954-21-0283-0.
Maftei, Mara Magda, Shivarov, Aleksandar Asenov (2007)
Environmental Aspect of Sustainable Development,
Варна: Унив. изд. Наука и икономика, с. 34 - 39, 978-954-21-0283-0
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