National Science Teachers Association & Gabel, D. (1994). Handbook of research on science teaching and learning. Macmillan.
Lua i Stíl Chicago (17ú heag.)National Science Teachers Association agus Dorothy Gabel. Handbook of Research on Science Teaching and Learning. New York: Macmillan, 1994.
Lua MLA (9ú heag.)National Science Teachers Association agus Dorothy Gabel. Handbook of Research on Science Teaching and Learning. Macmillan, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.