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Шилов, Игорь Александрович. Экология [Электронный ресурс]: учебник / И. А. Шилов. — 7-е изд. — М.: Юрайт, 2011. — (Основы наук). — <URL:https://elib.bashedu.ru/dl/read/Shilov_Ekologija_u_Yurajt_2011.pdf>.
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| Last day | 0 | 0 | 0 | 0 | 0 |
| Last 30 days | 0 | 0 | 0 | 0 | 0 |
| Last 365 days | 3 | 0 | 0 | 0 | 3 |
| All time | 27 | 0 | 0 | 0 | 27 |