Stone, A. H., & Sherman, L. R. (1975). Spaceship earth: Life science. Teacher's ed (Teacher's ed.). Houghton Mifflin Company.
Lua i Stíl Chicago (17ú heag.)Stone, A. Harris, agus Lloyd R. Sherman. Spaceship Earth: Life Science. Teacher's Ed. Teacher's ed. Boston: Houghton Mifflin Company, 1975.
Lua MLA (8ú heag.)Stone, A. Harris, agus Lloyd R. Sherman. Spaceship Earth: Life Science. Teacher's Ed. Teacher's ed. Houghton Mifflin Company, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.