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♦ 1Comparative breeding biology of Hen Harrier and Montagus Harrier: an 8-year study in north-eastern France, A. MILLON, J.-L. BOURRIOUX, C. RIOLS & V. BRETAGNOLLE, Ibis (2002), 144, 94105
♦ 2Nestling diet and parental provisioning behaviour in the Marsh harrier (Circus aeruginosus), Marcin BRZEZIŃSKI, Michał ŻMIHORSKI, Acta Zoologica Lituanica, 2009, Volumen 19, Numerus 2