Bradfield, D. J. (1966). Guide to extension training. Food and Agriculture Organization of the United Nations.
芝加哥风格引文Bradfield, D. J. Guide to Extension Training. Rome: Food and Agriculture Organization of the United Nations, 1966.
MLA引文Bradfield, D. J. Guide to Extension Training. Food and Agriculture Organization of the United Nations, 1966.
警告：这些引文格式不一定是100％准确.