Dyfyniad APA

Burrough, P. A. (2015). Principles of geographical information systems. Oxford University Press.

Dyfyniad Arddull Chicago

Burrough, Peter A. Principles of Geographical Information Systems. UK: Oxford University Press, 2015.

Dyfyniad MLA

Burrough, Peter A. Principles of Geographical Information Systems. Oxford University Press, 2015.

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