APA
Robert L. Brent, . (1968). The Pediatric Clinics of North America. London: W. B. Saunders Company.
Chicago
Robert L. Brent, . 1968. The Pediatric Clinics of North America. London: W. B. Saunders Company.
Harvard
Robert L. Brent, . (1968). The Pediatric Clinics of North America. London: W. B. Saunders Company.
MLA
Robert L. Brent, . The Pediatric Clinics of North America. London: W. B. Saunders Company. 1968.