hassouna, w. a. (1970). basic economic concepts for health planners. the institute of national planning.
Чикаго стиль цитування (17-те видання)hassouna, w. a. Basic Economic Concepts for Health Planners. cairo: the institute of national planning, 1970.
Стиль цитування MLA (9-ме видання)hassouna, w. a. Basic Economic Concepts for Health Planners. the institute of national planning, 1970.