Dòng Nội dung
1
Earthwatch / Susan Stempleski
Englewood Cliffs, N. J. : Regents/Prentice Hall, 1994
158 p. ; 24 cm.
2
Our common future / World Commission on Environment and Development.
New York : Oxford University Press, 1987
[383 p.] ; 30 cm.
World Commission on Environment and Development.