Marsh, U. G. (1972). Salesmanship: Modern principles and practise. Prentice-Hall of India.
Dyfyniad Arddull ChicagoMarsh, U. Grant. Salesmanship: Modern Principles and Practise. New Jersey: Prentice-Hall of India, 1972.
Dyfyniad MLAMarsh, U. Grant. Salesmanship: Modern Principles and Practise. Prentice-Hall of India, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.