Cabaj, W., J. Bień, A. Cybulska, A. Kornacka, B. Moskwa, and M. Krzysiak. “Neospora Caninum in European Bison Eliminated at Białowieża in 2012–2013”. European Bison Conservation Newsletter, vol. 6, Sept. 2013, pp. 85-90, http://ojs.wisent.org/index.php/czasopismo/article/view/97.