APA Style
Polar Bears In Trouble. (2009).
London:
Heinle Cengage Learning.
Chicago Style
Polar Bears In Trouble.
.
London:
Heinle Cengage Learning,
2009.
.
MLA Style
Polar Bears In Trouble.
.
London:
Heinle Cengage Learning,
2009.
.
Turabian Style
Polar Bears In Trouble.
London:
Heinle Cengage Learning,
2009.
.