Não informado. (1971). Journal of the College Science Teaching. National Science Teachers Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of the College Science Teaching. Washington: National Science Teachers Association, 1971.
Lua MLA (8ú heag.)Não informado. Journal of the College Science Teaching. National Science Teachers Association, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.