Tull, D. S. (1993). Marketing research (6th ed.). Prentice Hall.
Citación estilo ChicagoTull, Donald S. Marketing Research. 6th ed. New Delhi: Prentice Hall, 1993.
Cita MLATull, Donald S. Marketing Research. 6th ed. Prentice Hall, 1993.
Warning: These citations may not always be 100% accurate.