Eckholm, E. P. (1982). Down to earth: Environment and human needs. Norton.
Chicago Edition CitationEckholm, Erik P. Down to Earth: Environment and Human Needs. New York: Norton, 1982.
Cita MLAEckholm, Erik P. Down to Earth: Environment and Human Needs. Norton, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.