Conrad Niell Sureda (Sureda, Conrad Niell)

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  El Loro Gris Africano O Yaco/ Keeping African Grey Parrots
  by David Alderton, Conrad Niell Sureda
  Hardcover, Hispano Europea, ISBN 8425511860 (84-255-1186-0)
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  El Yaco O Loro Gris Africano/ Training African Grey Parrots: Cuidados, Crianza, Adiestramiento
  by Risa Teitler, Conrad Niell Sureda
  Softcover, Hispano Europea, ISBN 8425510511 (84-255-1051-1)