Gray David E. (2009). Doing Research in the Real World (2nd.). Sage Pub.
Lua i Stíl Chicago (17ú heag.)Gray David E. Doing Research in the Real World. 2nd. London: Sage Pub, 2009.
Lua MLA (9ú heag.)Gray David E. Doing Research in the Real World. 2nd. Sage Pub, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.