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♦ 1Orłowski, G., & Czarnecka, J. (2013). Re-evaluation of the role of the grey partridge Perdix perdix as a disperser of arable weed seeds. Journal of ornithology, 154(1), 139-144.
♦ 2CONTRIBUTION TO THE KNOWLEDGE OF THE DIET OF IRANIAN BIRDS, Abolghasem Khaleghizadeh, Mohammad E. Sehhatisabet, Екологія, Беркут 15, Вип. 1-2. 2006. pp. 145-150