Spencer, H. Essays on Education ETC. J.M. Dent.
Lua i Stíl Chicago (17ú heag.)Spencer, Herbert. Essays on Education ETC. London: J.M. Dent.
Lua MLA (9ú heag.)Spencer, Herbert. Essays on Education ETC. J.M. Dent.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.