Environmental Encyclopedia. Marci Bortman, Peter Brimblecombe, Mary Ann Cunningham, William P. Cunningham, William Freedman, eds. 3rd edition. 2 vols. Farmington Hills, Michigan: Gale, 2003.

Environmental Encyclopedia. Marci Bortman, Peter Brimblecombe, Mary Ann Cunningham, William P. Cunningham, William Freedman, eds. 3rd edition. 2 vols. Farmington Hills, Michigan: Gale, 2003.