Gilbert, M., & Gilbert, M. (1978). On social facts.
Lua i Stíl Chicago (17ú heag.)Gilbert, M., agus Margaret Gilbert. On Social Facts. 1978.
Lua MLA (9ú heag.)Gilbert, M., agus Margaret Gilbert. On Social Facts. 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.