Niamniampapagei (Poicephalus crassus)
    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.
    • Hoppe, D. & P. Welcke (2006): Langflügelpapageien. Stuttgart.
    • Jordan, R. & J. Pattison (1999): African Parrots. Surrey.
    • Joao, A. & N. Brickell (1981): Aviary breeding of Niam-Niam- and Red-bellied Parrots. Cage and Aviary Birds, 1: 3.
    • Juniper, T. & M. Parr (2003): Parrots. Sussex.
    • Low, R. (1983:) Das Papageienbuch. Stuttgart.
    • Low, R. (1988): Parrots- their care and breeding. London.
    • Perrin, Mike: Parrots of Africa, Madagascar and the Mascarene Islands
    • Robiller, F. (1997): Papageien, Band 2. Stuttgart.
    • Wagener, V. & W. Lantermann (1990): Die afrikanischen Großpapageien. Augsburg.
    • Zoologischer Beitrag Museum Alexander König, Bonn: Variation in and the Relationships of the Brownheaded Parrot of the Eastern African Lowlands, Heft 28/1977 Seite 279-291