Carroll, Glenn (1982). "National city-size distributions what do we know after 67 years of research?". Progress in Human Geography. 6 (1): 1–43. doi:10.1177/030913258200600101. S2CID153703477.
Carroll, Glenn (1982). "National city-size distributions what do we know after 67 years of research?". Progress in Human Geography. 6 (1): 1–43. doi:10.1177/030913258200600101. S2CID153703477.