Corylus avellana [online]. iNaturalist; A joint initiative by the California Academy of Sciences and the National Geographic Society, [cit. 2022-05-02]. Dostupné online. (anglicky)
iNaturalist; A joint initiative by the California Academy of Sciences and the National Geographic Society, [cit. 2022-05-02]. Dostupné online. (anglicky)
iNaturalist; A joint initiative by the California Academy of Sciences and the National Geographic Society, [cit. 2022-05-02]. Dostupné online. (anglicky)
Contarinia coryli [online]. iNaturalist; A joint initiative by the California Academy of Sciences and the National Geographic Society, [cit. 2022-05-02]. Dostupné online. (anglicky)
Phytoptus avellanae [online]. iNaturalist; A joint initiative by the California Academy of Sciences and the National Geographic Society, [cit. 2022-05-02]. Dostupné online. (anglicky)