Kelley, L. P. The Human Element.
Lua i Stíl Chicago (17ú heag.)Kelley, Leo P. The Human Element.
Lua MLA (9ú heag.)Kelley, Leo P. The Human Element.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)