Gaya APA
Sherrod, D, R. (2008).
A Volcano Rekindled : the Renewed Eruption of Mount St Helens, 2004 - 2006 .
Virginia:
U S Geological Survey.
Gaya MLA
Sherrod, David, R.
"A Volcano Rekindled : the Renewed Eruption of Mount St Helens, 2004 - 2006".
Virginia:
U S Geological Survey,
2008.
Text.