Unwin, D. J. (1981). Introductory spatial analysis. Methuen.
Lua i Stíl Chicago (17ú heag.)Unwin, David J. Introductory Spatial Analysis. London: Methuen, 1981.
Lua MLA (9ú heag.)Unwin, David J. Introductory Spatial Analysis. Methuen, 1981.
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