Preston, R. E. Transition zone structure: The three-sector hypothesis. Town Planning Review.
Citazione stile Chigago Style (17a edizione)Preston, Richard E. "Transition Zone Structure: The Three-sector Hypothesis." Town Planning Review .
Citatione MLA (9a ed.)Preston, Richard E. "Transition Zone Structure: The Three-sector Hypothesis." Town Planning Review, .
Attenzione: Queste citazioni potrebbero non essere precise al 100%.