المؤلفون: Karl. Graul, William. Germann, Tiruvaḷḷuvar.
الوصول الحر: https://www.europeana.eu/item/9200143/BibliographicResource_2000069365612?utm_source=api&utm_medium=api&utm_campaign=YuvuWBeCaTest
الوصول الحر: http://europeana.eu/portal/record/9200143/BibliographicResource_2000069365612.htmlTest