(2016). Polar bears matter / by Tammy Gagne ; content consultant: Jeff Welker.
Tohutoru Kātū Chicago (17th ed.)Polar Bears Matter / by Tammy Gagne ; Content Consultant: Jeff Welker. 2016.
Tohutoro MLA (9th ed.)Polar Bears Matter / by Tammy Gagne ; Content Consultant: Jeff Welker. 2016.
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