Ross, R. (1974). Research: An introduction. Barnes & Noble books.
Lua i Stíl Chicago (17ú heag.)Ross, Robert. Research: An Introduction. New York: Barnes & Noble books, 1974.
Lua MLA (9ú heag.)Ross, Robert. Research: An Introduction. Barnes & Noble books, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.