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WikiPedia: Hôn nhân http://www.britannica.com/EBchecked/topic/366152 http://euobserver.com/social/27161 http://books.google.com/?id=hR0_CoNj6GAC&pg=RA1-PA... http://books.google.com/books?id=1ha9GgWNmy0C&pg=P... http://jfh.sagepub.com/cgi/content/short/32/4/343 http://adsabs.harvard.edu/abs/2003JMolE..57...85D http://www.economics.uci.edu/~dbell/marriageandleg... http://eclectic.ss.uci.edu/~drwhite/worldcul/Codeb... //www.ncbi.nlm.nih.gov/pubmed/12962309 //dx.doi.org/10.1007%2Fs00239-003-2458-x