Forcese, D. (1973). Social research methods. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Forcese, D. Social Research Methods. Wood Clifts: Prentice Hall, 1973.
Lua MLA (9ú heag.)Forcese, D. Social Research Methods. Prentice Hall, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.