MITZEL, H. E. [. Encyclopedia of educational research vo.1.-- Ed.5. Macmillan Pub.
Lua i Stíl Chicago (17ú heag.)MITZEL, Harold E. [Ed.]. Encyclopedia of Educational Research Vo.1.-- Ed.5. London: Macmillan Pub.
Lua MLA (9ú heag.)MITZEL, Harold E. [Ed.]. Encyclopedia of Educational Research Vo.1.-- Ed.5. Macmillan Pub.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.