35 lat utrzymania i hodowli żubra (Bison bonasus) w Thüringer Waldzoo Gera. European Bison Conservation Newsletter, [S. l.], v. 2, p. 165–171, 2009. Disponível em: https://ojs.wisent.org/index.php/czasopismo/article/view/186. Acesso em: 28 lip. 2026.