Spencer, H. The dynamic psychology of education. s.n.
Lua i Stíl Chicago (17ú heag.)Spencer, Herbert. The Dynamic Psychology of Education. [S.l: s.n.
Lua MLA (9ú heag.)Spencer, Herbert. The Dynamic Psychology of Education. s.n.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.