SITS, E. Über die Verbreitung des Ortolans, Emberiza hortulana L., in NW-Eesti (Estland). Ornis Fennica, [S. l.], v. 14, n. 3–4, p. 90–95, 1937. Disponível em: https://ornisfennica.journal.fi/article/view/132371. Acesso em: 26 dec. 2024.