NATIONAL PRODUCTIVITY COUNCIL. (1977). NATIONAL CONVENTION ON PRODUCTIVITY. NATIONAL PRODUCTIVITY COUNCIL.
芝加哥风格引文NATIONAL PRODUCTIVITY COUNCIL. NATIONAL CONVENTION ON PRODUCTIVITY. NEW DELHI: NATIONAL PRODUCTIVITY COUNCIL, 1977.
MLA引文NATIONAL PRODUCTIVITY COUNCIL. NATIONAL CONVENTION ON PRODUCTIVITY. NATIONAL PRODUCTIVITY COUNCIL, 1977.
警告：这些引文格式不一定是100％准确.