Literature
Buku Teks
Sheriff, Robert E.
Exploration seismology
Cambridge University Press, 1994
Buku Teks
Exploration of the universe
Buku Teks
Hale, John R.
Age of exploration
Time-Life Books, 1974
Buku Teks
Abell, George O.
Exploration of the universe
Holt Rinehart and Winston, 1974
Buku Teks