Lawrence, M. S. (1998). If you're not out selling, you're being outsold. New York: John Wiley & Sons.
Dyfyniad Arddull ChicagoLawrence, Michael St. If You're Not Out Selling, You're Being Outsold. New York: John Wiley & Sons, 1998.
Dyfyniad MLALawrence, Michael St. If You're Not Out Selling, You're Being Outsold. New York: John Wiley & Sons, 1998.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.