Alex (Graupapagei) (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Alex (Graupapagei)" in German language version.

refsWebsite

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654^th place

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203^rd place

economist.com

Alex the African Grey. Science's best known parrot died on September 6th, aged 31. In: The Economist. 20. September 2007, abgerufen am 7. August 2014 (englisch).

nature.com

David Chandler: Farewell to a famous parrot. Alex, who could talk and count, dies at 31. 11. September 2007, abgerufen am 7. August 2014 (englisch).

pbs.org

Ask the Scientists: Irene Pepperberg Q&A. Abgerufen am 11. September 2007.