APA

Berry B. J. L., .From malthusian frontier to demographic steady state : the concordian birth rate, 1635-1993. : .

Chicago

Berry Brian J L, .From malthusian frontier to demographic steady state : the concordian birth rate, 1635-1993. : .

Harvard

Berry B. J. L., .From malthusian frontier to demographic steady state : the concordian birth rate, 1635-1993. : .

MLA

Berry Brian J L, .: . .