Liên kết ngoài Tiếng Punjab

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WikiPedia: Tiếng Punjab http://www.crulp.org/Publication/Crulp_report/CR02... https://books.google.com/books?id=O2n4sFGDEMYC&pg=... http://www.ne.se/spr%C3%A5k/v%C3%A4rldens-100-st%C... http://opishposh.com/the-top-10-most-spoken-langua... https://web.archive.org/web/20150716184244/http://... https://web.archive.org/web/20110912021653/http://... http://www.census.gov.pk/MotherTongue.htm http://www.ons.gov.uk/ons/rel/census/2011-census/k... http://www12.statcan.gc.ca/census-recensement/2011... http://www12.statcan.ca/census-recensement/2006/dp...