علامة معتمدة (Arabic Wikipedia)

Analysis of information sources in references of the Wikipedia article "علامة معتمدة" in Arabic language version.

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doi.org

  • "HISTORICAL DEVELOPMENT OF CERTIFICATION AND COLLECTIVE MARKS". Certification and Collective Marks: 8–27. DOI:10.4337/9781785368806.00010. مؤرشف من الأصل في 2020-03-13.

elgaronline.com

  • "HISTORICAL DEVELOPMENT OF CERTIFICATION AND COLLECTIVE MARKS". Certification and Collective Marks: 8–27. DOI:10.4337/9781785368806.00010. مؤرشف من الأصل في 2020-03-13.

web.archive.org

  • "HISTORICAL DEVELOPMENT OF CERTIFICATION AND COLLECTIVE MARKS". Certification and Collective Marks: 8–27. DOI:10.4337/9781785368806.00010. مؤرشف من الأصل في 2020-03-13.