Sumner, J. R. (1972). Statistics for hotels and catering. Edward Arnold.
芝加哥风格引文Sumner, John R. Statistics for Hotels and Catering. [London]: Edward Arnold, 1972.
MLA引文Sumner, John R. Statistics for Hotels and Catering. Edward Arnold, 1972.
警告：这些引文格式不一定是100％准确.