Tóth, N., P. Gyüre, J. Posta, and L. Juhász. “Population Date of Great Cormorant at the Area of the Hortobágy Fish Farm Co”. Acta Agraria Debreceniensis, no. 51, Feb. 2013, pp. 51-54, doi:10.34101/actaagrar/51/2061.