Barr, B. B., & Leyden, M. B. (1980). Life science. Addison-Wesley.
Lua i Stíl Chicago (17ú heag.)Barr, Bonnie B., agus Michael B. Leyden. Life Science. Menlo Park, CA: Addison-Wesley, 1980.
Lua MLA (9ú heag.)Barr, Bonnie B., agus Michael B. Leyden. Life Science. Addison-Wesley, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.