brown bear | Facts & Habitat. Encyclopedia Britannica [online]. [cit. 2019-11-07]. Dostupné online. (anglicky)
doi.org
dx.doi.org
PACIFIC GEOGRAPHICAL INSTITUTE FEB RAS; SERYODKIN, I.V.; PACZKOWSKI, J. MAIN MORPHOMETRIC CHARACTERISTICS OF BROWN BEARS IN KAMCHATKA AND SAKHALIN. Bulletin оf Kamchatka State Technical University. 2017, čís. 41, s. 83–92. Dostupné online [cit. 2022-08-07]. DOI10.17217/2079-0333-2017-41-83-92.
elibrary.ru
PACIFIC GEOGRAPHICAL INSTITUTE FEB RAS; SERYODKIN, I.V.; PACZKOWSKI, J. MAIN MORPHOMETRIC CHARACTERISTICS OF BROWN BEARS IN KAMCHATKA AND SAKHALIN. Bulletin оf Kamchatka State Technical University. 2017, čís. 41, s. 83–92. Dostupné online [cit. 2022-08-07]. DOI10.17217/2079-0333-2017-41-83-92.
google.cz
books.google.cz
SCIENCES, John P. Rafferty Associate Editor, Earth. Carnivores: Meat-eating Mammals. [s.l.]: The Rosen Publishing Group, Inc 315 s. Dostupné online. ISBN9781615303403. S. 29. (anglicky) Google-Books-ID: EMui7zVOqeUC.