1. ILO.Guidelines for the use of the ILO international classification of radiographs of pneumoconioses Revised Edition 2011. Occupational Safety and Health Series No. 22 International Labour Office Geneva.2011.
2. The ILO/WHO global programme for the elimination of silicosis. Occupational Health Southern;Fedotov I;Africa,2006
3. Thirteenth Session of the Joint ILO/WHO Committee on Occupational Health.Report of the Committee JCOH/XIII/D.4 International Labour Office Geneva. [Online].2003.http://www.icohweb.org/site/multimedia/asbestos/Enclosure_5.pdf. Accessed July 6 2018.
4. SuganumaN MurataK KusakaY.CR and FPD DR chest radiographic image parameters for the pneumoconiosis: the Japanese approach and experience. [Online].2008.http://www.cdc.gov/niosh/docs/2008-139/pdfs/manuscript-suganuma-imageparameters.pdf. Accessed July 6 2018.
5. National Institute for Occupational Safety and Health.Application of the ILO International Classification of Radiographs of Pneumoconiosis to Digital Chest Radiographic Images NIOSH Scientific Workshop. Workshop summary. DHHS (NIOSH) Publication Number 2008–139. [Online].2008.https://www.cdc.gov/niosh/docs/2008-139/workshopsummary.html. Accessed July 6 2018