Frey, W. H. Three Americas: The rising significance of regions. Journal of the American Planning Association.
Chicagoスタイル(17版)引用形式Frey, William H. "Three Americas: The Rising Significance of Regions." Journal of the American Planning Association .
MLA(9版)引用形式Frey, William H. "Three Americas: The Rising Significance of Regions." Journal of the American Planning Association, .
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