APA
Scientific American Magazine, Scientific American Magazine, . (1990). Managing planet earth. New York: Longman Publishers U S A.
Chicago
Scientific American Magazine, Scientific American Magazine, . 1990. Managing planet earth. New York: Longman Publishers U S A.
Harvard
Scientific American Magazine, Scientific American Magazine, . (1990). Managing planet earth. New York: Longman Publishers U S A.
MLA
Scientific American Magazine, Scientific American Magazine, . Managing planet earth. New York: Longman Publishers U S A. 1990.
