1. Bateson, Gregory Problems in Cetacean and Other Mammalian Communication
    (reprinted in Steps to an Ecology of Mind)
  2. Lorenz, Konrad L. King Solomon's Ring
  3. Markowitz, Hal Behavior of Captive Wild Animals Published 1978
  4. Markowitz, Hal Behavioral Enrichment in the Zoo Published 1981
  5. The Shape of Enrichment [newsletter]
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Last update 29-Aug-1998 by DBS.