Mental health services in developing countries : Papers presented at a WHO Seminar on the organization of mental health services, Addis Ababa, 1973 27 november to 4 december - Baasher, T. A.; Carstairs, G. M. (G. Morris), 1916-1991; Giel, R. (Robert), 1930-; Hassler, F. R. (Ferdinand Rudolph), 1770-1843 (Geneva : WHO, 1975)