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MalayM.SarkarMalayM., D.M.D.M.MaheshD.M.D.M., IrappaI.MadabhaviIrappaI., Digital clubbing, „Lung India : Official Organ of Indian Chest Society”, 29 (4), 2012, s. 354–362, DOI: 10.4103/0970-2113.102824, ISSN0970-2113, PMID: 23243350, PMCID: PMC3519022 [dostęp 2018-07-03].
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MalayM.SarkarMalayM., D.M.D.M.MaheshD.M.D.M., IrappaI.MadabhaviIrappaI., Digital clubbing, „Lung India : Official Organ of Indian Chest Society”, 29 (4), 2012, s. 354–362, DOI: 10.4103/0970-2113.102824, ISSN0970-2113, PMID: 23243350, PMCID: PMC3519022 [dostęp 2018-07-03].