Lua APA (7ú heag.)
Ferber, R. (1949). Market research. McGraw Hill.
Lua i Stíl Chicago (17ú heag.)
Ferber, Robert. Market Research. New York: McGraw Hill, 1949.
Lua MLA (9ú heag.)
Ferber, Robert. Market Research. McGraw Hill, 1949.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.