Popkin, B. (1973). Some social and economic considerations in developing a national food and nutrition program. [s.n.].
芝加哥风格引文Popkin, Barry. Some Social and Economic Considerations in Developing a National Food and Nutrition Program. [s.l.]: [s.n.], 1973.
MLA引文Popkin, Barry. Some Social and Economic Considerations in Developing a National Food and Nutrition Program. [s.n.], 1973.
警告：这些引文格式不一定是100％准确.