Não informado. (1976). Educational Research Quarterly. University of Southern California, School of Education.
Lua i Stíl Chicago (17ú heag.)Não informado. Educational Research Quarterly. Los Angeles, Calif: University of Southern California, School of Education, 1976.
Lua MLA (8ú heag.)Não informado. Educational Research Quarterly. University of Southern California, School of Education, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.