1. Thomas P Green, Susanna A. McColley. Disorders of the lungs and lower airways. In Richard E. Behrman, Robert Kleigman, Hal B. Jenson, ed.Nelson Text Book of Pediatrics. 17th ed. Philadelphia; Saunders, 2004: 1401.
2. Wald ER. Recurrent and non resolving pneumonia in children.Sem Resp Infect 1993; 8: 46–58.
3. Recent Advances in Pediatrics;Suraj Gupte,1997
4. Theodore C. Sectish, Charles G Prober. Pneumonia. In Richard E. Behrman, Robert Kliegman, Hal B. Jenson, ed.Nelson Text Book of Pediatrics. 17th ed. Philadelphia; Saunders, 2004; 1401.
5. Recent Advances in Pediatrics;Suraj Gupte,1997