Theodore, M. K., & Theodore, L. (1996). Major environmental issues facing the 21st century. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Theodore, Mary K., agus Louis Theodore. Major Environmental Issues Facing the 21st Century. Upper Saddle River, NJ: Prentice Hall, 1996.
Lua MLA (8ú heag.)Theodore, Mary K., agus Louis Theodore. Major Environmental Issues Facing the 21st Century. Prentice Hall, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.