Keany, M. (1981). Earth Science laboratory/activity book: Annotated teacher's edition. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Keany, Michael. Earth Science Laboratory/activity Book: Annotated Teacher's Edition. Prentice Hall, 1981.
Lua MLA (9ú heag.)Keany, Michael. Earth Science Laboratory/activity Book: Annotated Teacher's Edition. Prentice Hall, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.