Biological Sciences Curriculum Study. (1969). Biological science, an inquiry into life, second edition: Teacher's manual. Harcourt, Brace & World.
Lua i Stíl Chicago (17ú heag.)Biological Sciences Curriculum Study. Biological Science, an Inquiry into Life, Second Edition: Teacher's Manual. New York: Harcourt, Brace & World, 1969.
Lua MLA (8ú heag.)Biological Sciences Curriculum Study. Biological Science, an Inquiry into Life, Second Edition: Teacher's Manual. Harcourt, Brace & World, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.