Webber, M. M. Planning in an environment of change: Part III : permissive planning. Town Planning Review.
Lua i Stíl Chicago (17ú heag.)Webber, Melvin M. "Planning in an Environment of Change: Part III : Permissive Planning." Town Planning Review .
Lua MLA (9ú heag.)Webber, Melvin M. "Planning in an Environment of Change: Part III : Permissive Planning." Town Planning Review, .
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