Crosby, P. B. (1979). Quality is free: The art of making quality certain. McGraw-Hill.
芝加哥风格引文Crosby, Philip B. Quality Is Free: The Art of Making Quality Certain. New York: McGraw-Hill, 1979.
MLA引文Crosby, Philip B. Quality Is Free: The Art of Making Quality Certain. McGraw-Hill, 1979.
警告：这些引文格式不一定是100％准确.