Poulsen, E. (2009). Smiling bears: A zookeeper explores the behavior and emotional life of bears. Greystone Books.
Citace podle Chicago (17th ed.)Poulsen, Else. Smiling Bears: A Zookeeper Explores the Behavior and Emotional Life of Bears. Vancouver: Greystone Books, 2009.
Citace podle MLA (9th ed.)Poulsen, Else. Smiling Bears: A Zookeeper Explores the Behavior and Emotional Life of Bears. Greystone Books, 2009.
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