Preston, R. E. Transition zone structure: The three-sector hypothesis. Town Planning Review.
Chicago Style aipamenaPreston, Richard E. "Transition Zone Structure: The Three-sector Hypothesis." Town Planning Review .
MLA aipamenaPreston, Richard E. "Transition Zone Structure: The Three-sector Hypothesis." Town Planning Review, .
Kontuz: berrikusi erreferentzia hauek erabili aurretik.