Andrews, R. (2003). Research questions. Continuum.
Lua i Stíl Chicago (17ú heag.)Andrews, Richard. Research Questions. London ; New York: Continuum, 2003.
Lua MLA (8ú heag.)Andrews, Richard. Research Questions. Continuum, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.