APA
El Ibiary S., de Coster E. J., Tolba F. M., van Maaren P., Wasily L., van Cleeff M., el Saied K., Veen J., Zaher H. A. & Borgdorff M. W. (19990722). Trend in the annual risk of tuberculous infection in Egypt, 1950-1996. : The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease.
Chicago
El Ibiary S, de Coster E J, Tolba F M, van Maaren P, Wasily L, van Cleeff M, el Saied K, Veen J, Zaher H A and Borgdorff M W. 19990722. Trend in the annual risk of tuberculous infection in Egypt, 1950-1996. : The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease.
Harvard
El Ibiary S., de Coster E. J., Tolba F. M., van Maaren P., Wasily L., van Cleeff M., el Saied K., Veen J., Zaher H. A. and Borgdorff M. W. (19990722). Trend in the annual risk of tuberculous infection in Egypt, 1950-1996. : The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease.
MLA
El Ibiary S, de Coster E J, Tolba F M, van Maaren P, Wasily L, van Cleeff M, el Saied K, Veen J, Zaher H A and Borgdorff M W. Trend in the annual risk of tuberculous infection in Egypt, 1950-1996. : The international journal of tuberculosis and lung disease : the official journal of the International Union against Tuberculosis and Lung Disease. 19990722.