Graukopfpapagei (Poicephalus fuscicollis)
    Literatur:
    • Arndt, T. (1990-2008): Lexikon der Papageien. Bretten.
    • Forshaw, J. M. (1981): Parrots of the World. Melbourne.
    • Fry, C., S. Keith & E. Urban (1988): Birds of Africa, Vol. III. London.
    • Hockey, P., R. Dean & P. Ryan (2005): Roberts birds of Southern Africa. VII. Edition. Cape Town.
    • Hoppe, D. & P. Welcke (2006): Langflügelpapageien. Stuttgart.
    • Hoppe, D. & P. Welcke (2006): Der Graukopfpapagei. Papageien, 19 (4): 128-135.
    • Isert, G. (1977): Zucht des Benguellapapageis. Gef. Welt, 101 (5): 145-148.
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    • Low, R. (1983:) Das Papageienbuch. Stuttgart.
    • Low, R. (1988): Parrots- their care and breeding. London.
    • Low, R. (2001): Haltung und Zucht des Kuhls Kap-Papageis. Papageien, 14 (10): 332-335.
    • Perrin, M.R. (2005): A review of the taxonomic status and biology of the Cape Parrot, with reference to the Brown-necked- and Grey-headed Parrot. Ostrich, 76 (3&4): 195-205.
    • Pfeiffer, I. & P. Welcke (2007): Untersuchungen zur Molekulargenetischen Unterartidentifizierung am Beispiel des Graukopfpapageis. Papageien, 20 (8): 272-274.
    • Robiller, F. (1997): Papageien, Band 2. Stuttgart.
    • Symes, C. & M. Perrin (2004): Breeding biology of the Grey-headed Parrot in the wild. Emu, 104 (1): 45-57.
    • Wagener, V. & W. Lantermann (1990): Die afrikanischen Großpapageien. Augsburg.