International Geophysical Conference and Exposition
Indonesian Association of Geophysicists (HAGI), 1996
Buku Referensi
Tarbuck, Edward J., author
Maxwell Macmillan, 1993
Buku Teks
Davidson, Jon P., author
Prentice Hall, 1997
Buku Teks
Skinner, Brian J., author
John Wiley & Sons, 1987
Buku Teks
Press, Frank, author
W H Freeman , 1974
Buku Teks