Thực đơn
Pitirim_Sorokin Tham khảo|title=
trống hay bị thiếu (trợ giúp)Thực đơn
Pitirim_Sorokin Tham khảoLiên quan
Tài liệu tham khảo
WikiPedia: Pitirim_Sorokin http://cantic.bnc.cat/registres/CUCId/a10159290 http://data.rero.ch/02-A021763067 http://dictionary.reference.com/browse/sorokin http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://katalog.nsk.hr/F/?func=direct&doc_number=00... http://data.bibliotheken.nl/id/thes/p068454732 http://mak.bn.org.pl/cgi-bin/KHW/makwww.exe?BM=1&N... https://nla.gov.au/anbd.aut-an35513153 https://trove.nla.gov.au/people/980311 https://books.google.com/books?id=0DamHoxHiCkC