Pyziel, Anna M., and Aleksander W. Demiaszkiewicz. 2009. “Enteric Coccidia of European Bison (Bison Bonasus) in Białowiez˙a Primeval Forest”. European Bison Conservation Newsletter 2 (September):119-22. http://ojs.wisent.org/index.php/czasopismo/article/view/179.