Dòng Nội dung
1
Energy in the natural environment / Thomas L. Burrus, Harold Yaffa.
Needham Heights, MA : Ginn Press, 1990
384 p. : ill., maps ; 28 cm
2
The origin of the universe / John D. Barrow.
New York : BasicBooks, 1994
xv, 150 p. : ill. ; 25 cm.