Breen, G. E., & Blankenship, A. (1982). Do-it-yourself marketing research (2d ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Breen, George Edward, agus A.B Blankenship. Do-it-yourself Marketing Research. 2d ed. New York: McGraw-Hill, 1982.
Lua MLA (9ú heag.)Breen, George Edward, agus A.B Blankenship. Do-it-yourself Marketing Research. 2d ed. McGraw-Hill, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.