Deep, S. D., & Sussman, L. 1. (1993). What to ask when you don't know what to say: 555 powerful questions to use for getting your way at work. Englewood Cliffs, N.J.: Prentice Hall.

Deep, Samuel D., and Lyle 1944- Sussman. What to Ask When You Don't Know What to Say: 555 Powerful Questions to Use for Getting Your Way At Work. Englewood Cliffs, N.J.: Prentice Hall, 1993.

Deep, Samuel D., and Lyle 1944- Sussman. What to Ask When You Don't Know What to Say: 555 Powerful Questions to Use for Getting Your Way At Work. Englewood Cliffs, N.J.: Prentice Hall, 1993.