Holbert, N. B., & Speece, M. W. (1993). Practical marketing research: An integrated global perspective. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Holbert, Neil Bruce, agus Mark W. Speece. Practical Marketing Research: An Integrated Global Perspective. New York: Prentice Hall, 1993.
Lua MLA (9ú heag.)Holbert, Neil Bruce, agus Mark W. Speece. Practical Marketing Research: An Integrated Global Perspective. Prentice Hall, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.