Singleton, R., & Straits, B. C. Approaches to social research (Fourth edition.).
Lua i Stíl Chicago (17ú heag.)Singleton, Royce, agus Bruce C. Straits. Approaches to Social Research. Fourth edition.
Lua MLA (8ú heag.)Singleton, Royce, agus Bruce C. Straits. Approaches to Social Research. Fourth edition.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.