Cita APA (7th ed.)

Frey, W. H. Three Americas: The rising significance of regions. Journal of the American Planning Association.

Cita Chicago (17th ed.)

Frey, William H. "Three Americas: The Rising Significance of Regions." Journal of the American Planning Association .

Cita MLA (9th ed.)

Frey, William H. "Three Americas: The Rising Significance of Regions." Journal of the American Planning Association, .