LeVan, T. D., Koh, W., Lee, H., Koh, D., Yu, M. C., & London, S. J. (2006). Vapor, Dust and Smoke Exposure in relation to adult-onset asthma and chronic respiratory symptoms: The Singapore Chinese Health Study.

LeVan, Tricia D., Woon-Puay Koh, Hin-Peng Lee, David Koh, Mimi C. Yu, and Stephanie J. London. Vapor, Dust and Smoke Exposure in Relation to Adult-onset Asthma and Chronic Respiratory Symptoms: The Singapore Chinese Health Study. 2006.

LeVan, Tricia D., et al. Vapor, Dust and Smoke Exposure in Relation to Adult-onset Asthma and Chronic Respiratory Symptoms: The Singapore Chinese Health Study. 2006.