Dyfyniad APA

O'Sullivan, D., & Unwin, D. J. (2003). Geographical information analysis. John Wiley & Sons.

Dyfyniad Arddull Chicago

O'Sullivan, David, and David J. Unwin. Geographical Information Analysis. New Jersey: John Wiley & Sons, 2003.

Dyfyniad MLA

O'Sullivan, David, and David J. Unwin. Geographical Information Analysis. John Wiley & Sons, 2003.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.