круговорот углерода . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%BA%D1%80%D1%83%D0%B3%D0%BE%D0%B2%D0%BE%D1%80%D0%BE%D1%82%20%D1%83%D0%B3%D0%BB%D0%B5%D1%80%D0%BE%D0%B4%D0%B0/1/rus (06.10.2026)
круговорот углерода . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/%D0%BA%D1%80%D1%83%D0%B3%D0%BE%D0%B2%D0%BE%D1%80%D0%BE%D1%82%20%D1%83%D0%B3%D0%BB%D0%B5%D1%80%D0%BE%D0%B4%D0%B0/1/rus (06.10.2026)
