Dyfyniad APA

Poehls, D., & Smith, G. J. (2009). Encyclopedic dictionary of Hydrogeology. Elsevier.

Dyfyniad Arddull Chicago

Poehls, D.J, and Gregory J. Smith. Encyclopedic Dictionary of Hydrogeology. Oxford: Elsevier, 2009.

Dyfyniad MLA

Poehls, D.J, and Gregory J. Smith. Encyclopedic Dictionary of Hydrogeology. Elsevier, 2009.

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