Cita APA (7th ed.)

Theodore, M. K., & Theodore, L. (1996). Major environmental issues facing the 21st century. Prentice Hall.

Cita Chicago (17th ed.)

Theodore, Mary K., i Louis Theodore. Major Environmental Issues Facing the 21st Century. Upper Saddle River, NJ: Prentice Hall, 1996.

Cita MLA (8th ed.)

Theodore, Mary K., i Louis Theodore. Major Environmental Issues Facing the 21st Century. Prentice Hall, 1996.