Dyfyniad APA

Walker, P., & Wood, E. (2010). Environmental science experiments. Facts on File.

Dyfyniad Arddull Chicago

Walker, Pam, and Elaine Wood. Environmental Science Experiments. New York: Facts on File, 2010.

Dyfyniad MLA

Walker, Pam, and Elaine Wood. Environmental Science Experiments. Facts on File, 2010.

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