Dyfyniad APA

Johnson, L. E. (2009). Geographic information system in water resources engineering. CRC Press.

Dyfyniad Arddull Chicago

Johnson, Lynn E. Geographic Information System in Water Resources Engineering. Boca Raton: CRC Press, 2009.

Dyfyniad MLA

Johnson, Lynn E. Geographic Information System in Water Resources Engineering. CRC Press, 2009.

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