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Dyfyniad Arddull ChicagoDandona, Lalit, and Rakhi Dandona. Revision of Visual Impairment Definitions in the International Statistical Classification of Diseases. BioMed Central, 2006.
Dyfyniad MLADandona, Lalit, and Rakhi Dandona. Revision of Visual Impairment Definitions in the International Statistical Classification of Diseases. BioMed Central, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.