Cambridge MA: Harvard University Press, (2002. reprint). Octavo, paperback.
Now in paperback. "Irene Pepperberg's studies of Alex are some of the most remarkable and significant in the whole field of animal cognition. Her evidence stands up to the closest scrutiny, and Alex the parrot turns out to have cognitive abilities that were not even suspected before Pepperberg began her work." Marian Dawkins, University of Oxford. Also available in hardcover.
Price: $25.00 AU