Leffingwell, W. (1975). Text book of office management (3rd.). McGraw Hill.
芝加哥风格引文Leffingwell, W. Text Book of Office Management. 3rd. New Delhi: McGraw Hill, 1975.
MLA引文Leffingwell, W. Text Book of Office Management. 3rd. McGraw Hill, 1975.
警告：这些引文格式不一定是100％准确.