Babbie, E. R. (2010). The practice of social research (12th ed.). Wadsworth Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Babbie, Earl R. The Practice of Social Research. 12th ed. Belmont, CA: Wadsworth Cengage Learning, 2010.
Lua MLA (9ú heag.)Babbie, Earl R. The Practice of Social Research. 12th ed. Wadsworth Cengage Learning, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.