Gilbreth, R. D. (1987). Forward thinking: The pragmatist's guide to Today's Business Trends. McGraw-Hill.
芝加哥风格引文Gilbreth, Robert D. Forward Thinking: The Pragmatist's Guide to Today's Business Trends. New York: McGraw-Hill, 1987.
MLA引文Gilbreth, Robert D. Forward Thinking: The Pragmatist's Guide to Today's Business Trends. McGraw-Hill, 1987.
警告：这些引文格式不一定是100％准确.