TY  - BOOK
AU  - Bekoff, Marc
AU  - Byers, John A
TI  - Animal play : evolutionary, comparative, and ecological perspectives
SN  - 9780521583831
SN  - 97022056
U1  - 591.563 BEK 
PY  - 1998///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Play behavior in animals
N1  - Includes bibliographical references and index
ER  -