Lee, H. K., Tso, E. Y., Chau, T. N., Tsang, O. T., Choi, W., & Lai, T. S. (2003). Asymptomatic Severe Acute Respiratory Syndrome–associated Coronavirus Infection. Centers for Disease Control and Prevention.

Lee, Harold K.K., Eugene Y.K Tso, T. N. Chau, Owen T.Y Tsang, W. Choi, and Thomas S.T Lai. Asymptomatic Severe Acute Respiratory Syndrome–associated Coronavirus Infection. Centers for Disease Control and Prevention, 2003.

Lee, Harold K.K., et al. Asymptomatic Severe Acute Respiratory Syndrome–associated Coronavirus Infection. Centers for Disease Control and Prevention, 2003.