(2017). Екологично инженерство и опазване на околната среда. National Society of Ecological Engineering and Environment Protection.
Style de citation Chicago (17e éd.)Екологично инженерство и опазване на околната среда. National Society of Ecological Engineering and Environment Protection, 2017.
Style de citation MLA (9e éd.)Екологично инженерство и опазване на околната среда. National Society of Ecological Engineering and Environment Protection, 2017.
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