APA
United Nations Economic and Social Affairs, United Nations Economic and Social Affairs, . (1976). Appropriate technologies in civil engineering work in developing countries. New: York United Nations USA.
Chicago
United Nations Economic and Social Affairs, United Nations Economic and Social Affairs, . 1976. Appropriate technologies in civil engineering work in developing countries. New: York United Nations USA.
Harvard
United Nations Economic and Social Affairs, United Nations Economic and Social Affairs, . (1976). Appropriate technologies in civil engineering work in developing countries. New: York United Nations USA.
MLA
United Nations Economic and Social Affairs, United Nations Economic and Social Affairs, . Appropriate technologies in civil engineering work in developing countries. New: York United Nations USA. 1976.