APA
WHO, . (1997). Improving the performance of health centres in district health systems. auth., Geneva: .
Chicago
WHO, . 1997. Improving the performance of health centres in district health systems. auth., Geneva: .
Harvard
WHO, . (1997). Improving the performance of health centres in district health systems. auth., Geneva: .
MLA
WHO, . Improving the performance of health centres in district health systems. auth., Geneva: . 1997.