1
2
by Hawking, Stephen W.
Published 1988
3
Published 1991
4
Published 1991
5
Published 1990
6
by Trefil, James S, 1938-
Published 1988
7
by Hamerman, Warren J.
Published 1985
8
Published 1992
9
by Boslough, John
Published 1984
10
by Sagan, Carl, 1934-
Published 1973
11
12
Published 1992
13
by Roy, Sara M
Published 1986