Allen, J. L. (1996). Environment 96/97. (15th ed.). Dushkin Publishing Group.
Tohutoru Kātū Chicago (17th ed.)Allen, John L. Environment 96/97. 15th ed. Connecticut: Dushkin Publishing Group, 1996.
Tohutoro MLA (9th ed.)Allen, John L. Environment 96/97. 15th ed. Dushkin Publishing Group, 1996.
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