Krasiński, Zbigniew A., Wanda Olech, Kajetan Perzanowski, Wojciech Bielecki, and Andrzej Bereszyński. 2011. “Conservation Plan for Wisent Bison Bonasus in Białowieski National Park”. European Bison Conservation Newsletter 4 (September):101-16. http://ojs.wisent.org/index.php/czasopismo/article/view/137.