American Educational Research Association & Mitzel, H. E. (1982). Encyclopedia of educational research (5th ed.). Free Press.
Lua i Stíl Chicago (17ú heag.)American Educational Research Association agus Harold E. Mitzel. Encyclopedia of Educational Research. 5th ed. New York: Free Press, 1982.
Lua MLA (9ú heag.)American Educational Research Association agus Harold E. Mitzel. Encyclopedia of Educational Research. 5th ed. Free Press, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.