Gilbreth, R. D. (1987). Forward thinking: The pragmatist's guide to Today's Business Trends. McGraw-Hill.
Citazione stile Chigago Style (17a edizione)Gilbreth, Robert D. Forward Thinking: The Pragmatist's Guide to Today's Business Trends. New York: McGraw-Hill, 1987.
Citatione MLA (9a ed.)Gilbreth, Robert D. Forward Thinking: The Pragmatist's Guide to Today's Business Trends. McGraw-Hill, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.