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Ердаков, Лев Николаевич. Человек в биосфере [электронный ресурс]: Учебное пособие / Л. Н. Ердаков. — 1. — Москва: ООО "Научно-издательский центр ИНФРА-М", 2013 — 206 с. — ВО - Бакалавриат. — <URL:https://znanium.com/catalog/document?id=50711>. — <URL:https://znanium.com/cover/0368/368478.jpg>.
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